Anyone else experiencing screen color temperature variation between devices? - Nexus 7 Q&A, Help & Troubleshooting

Just got my 1st replacement Nexus in the mail-the first one was exhibiting symptoms of a non-responsive touchscreen after heavy gaming or when exposed to sunlight. The replacement unit is almost flawless, except for one glaring flaw...the white balance on the screen is WAY off! Whites are tinted beige, and the screen looks extremely washed out and warm compared to my first one. Here's a side by side picture (not the best photo, difference is more pronounced to the naked eye).
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I'm tempted to send this one back, but I don't have the time to get stuck in a RMA loop, especially as I'll be travelling this month. What do you guys reckon-should I just keep this device with it's flawed WB, return for a replacement and hope for the best, or return for a refund?
Alternatively, is there any way I can dial out some of the warmness using software? I know there is a color tuning/calibration utility that is included with CM for my Galaxy S-anything similar exist for the N7?

I had the same issue as welll. My recent replacement has better whites bit the screen is still displaying a pinkish tint. My old nexus 7 had a yellowish tint as well. I wonder what the screen temperature is actually supposed to be :\

To the OP you are correct I've started two threads already about the color correction slash grey scale issues. Most agree that Google will not be doing anything about it. Just plain luck or bad luck. Both of those are not bad mine is just in between I would say.
I have linked to this video before http://www.youtube.com/watch?v=MD8n7xaPBMo the way cool blue tint on the unit shown would be grounds for return IMO. Whites need to be white, not yellow warm or cool blue. Just try and do a side by side with an iPad 3 if you can live with the offness then do so, its a lottery at this point.
I started two threads because so many people have said this is an issues, but it varies so much and is so subjective that its doubtful Google will do anything. I prefer the one to the right just because a little cool blue is way better than warm yellow but the New one on the left looks more accurate.
Hows the Backlight bleed?
A good simple test is I go to T-Mobile.com or Engadget their Magenta Pink and Engadget's sky blue are hard to get right. But then again that opens up a new can of worms about your color Gamut and Hue which I am sure also vary device to device. Its obvious by now this is a QC step Google did not require ASUS to perform. Most likely to improve production yields.

IceColdKila said:
To the OP you are correct I've started two threads already about the color correction slash grey scale issues. Most agree that Google will not be doing anything about it. Just plain luck or bad luck. Both of those are not bad mine is just in between I would say.
I have linked to this video before http://www.youtube.com/watch?v=MD8n7xaPBMo the way cool blue tint on the unit shown would be grounds for return IMO. Whites need to be white, not yellow warm or cool blue. Just try and do a side by side with an iPad 3 if you can live with the offness then do so, its a lottery at this point.
I started two threads because so many people have said this is an issues, but it varies so much and is so subjective that its doubtful Google will do anything. I prefer the one to the right just because a little cool blue is way better than warm yellow but the New one on the left looks more accurate.
Hows the Backlight bleed?
A good simple test is I go to T-Mobile.com or Engadget their Magenta Pink and Engadget's sky blue are hard to get right. But then again that opens up a new can of worms about your color Gamut and Hue which I am sure also vary device to device. Its obvious by now this is a QC step Google did not require ASUS to perform. Most likely to improve production yields.
Click to expand...
Click to collapse
Thanks for the informative reply. It's really unfortunate that Asus has dropped the ball so badly with consistency-I can understand lowering some standards for a $200 device to increase production yields, but they've seemingly neglected numerous aspects as evidenced by all the problems the community is having.
As for the new vs old one, the photo is not the best representation-the old device has perfect whites, completely neutral-no tinge of blue at all. Colors gamut is also pretty accurate on the old one. The new one is visibly worse-not only is the white balance off (whites appear beige), but colors are over-saturated and blown out-I noticed a loss of detail immediately just by looking at my wallpaper. Flesh tones are especially bad-much more red than they should be. I even had my roommate do a blind test between the new and old, and he immediately noted that the old device had a "sharper, crisper" screen.
As far as backlight bleed, it's not too bad on both Nexus's (Nexii?). The new one has a bit of bleed in the lower left corner, but it isn't very noticeable and is the least of my concerns at this point. I'm just not sure if it's worth entering the lottery again to see if I can get a better device based on all the horror stories I've been reading here...
Are you aware of any calibration/color tuning utility for the N7? Devs should look into integrating a utility into their ROMs. Something like this:

m3ta1head said:
Thanks for the informative reply. It's really unfortunate that Asus has dropped the ball so badly with consistency-I can understand lowering some standards for a $200 device to increase production yields, but they've seemingly neglected numerous aspects as evidenced by all the problems the community is having.
As for the new vs old one, the photo is not the best representation-the old device has perfect whites, completely neutral-no tinge of blue at all. Colors gamut is also pretty accurate on the old one. The new one is visibly worse-not only is the white balance off (whites appear beige), but colors are over-saturated and blown out-I noticed a loss of detail immediately just by looking at my wallpaper. Flesh tones are especially bad-much more red than they should be. I even had my roommate do a blind test between the new and old, and he immediately noted that the old device had a "sharper, crisper" screen.
As far as backlight bleed, it's not too bad on both Nexus's (Nexii?). The new one has a bit of bleed in the lower left corner, but it isn't very noticeable and is the least of my concerns at this point. I'm just not sure if it's worth entering the lottery again to see if I can get a better device based on all the horror stories I've been reading here...
Are you aware of any calibration/color tuning utility for the N7? Devs should look into integrating a utility into their ROMs. Something like this:
Click to expand...
Click to collapse
Sounds like they are messing with what would be called on HDTV's the Sharpness setting.Its gonna take a subpoena to find out what Google and ASUS knew about the color temperature slash calibration or lack their of, and when they knew it. I smell class action down the road. No way its just not right so many units coming out so differently.

Not only color, but I've noticed noticeable differences in brightness between the 3 I've gotten for RMAs. This new one gets darker and brighter than the previous one.
Sent from my Nexus 7 using xda premium

Mine is pretty much spot on, Except for Blue Links tend to be on the purple side of Blue, enough to start a few threads and ask some questions but definitely not warrant a return.
One thing I have its noticed is that its nice bright and vibrant not at all "washed out" as other have reported. But When I go into Display Brightness, (never Auto brightness) when I move the slider I have like 8 or more different levels of Low brightness below the the Halfway Mark so I can really pick to my licking how low I want the brightness, even on the lowest it maybe too bright for reading a book in a dark room.
But above the halfway mark of brightness I only get about 4 or 5 Steps Up to Max brightness, The last inch or more on the slider toward MAx brightness does nothing. So in essence I reach Max brightness well before the slider is maxed out.

IceColdKila said:
Mine is pretty much spot on, Except for Blue Links tend to be on the purple side of Blue, enough to start a few threads and ask some questions but definitely not warrant a return.
One thing I have its noticed is that its nice bright and vibrant not at all "washed out" as other have reported. But When I go into Display Brightness, (never Auto brightness) when I move the slider I have like 8 or more different levels of Low brightness below the the Halfway Mark so I can really pick to my licking how low I want the brightness, even on the lowest it maybe too bright for reading a book in a dark room.
But above the halfway mark of brightness I only get about 4 or 5 Steps Up to Max brightness, The last inch or more on the slider toward MAx brightness does nothing. So in essence I reach Max brightness well before the slider is maxed out.
Click to expand...
Click to collapse
That is very strange indeed. My brightness slider doesn't exhibit this-it is linear throughout it's range and the lowest brightness setting is quite dim, perfect for reading at night.

XDA developer Supercurio has an app called screen tuning for the Samsung 10.1 that I loved that changed the white temperature, which I believe is the issue. I think an app like this would help significantly.
Its also been said that the nvidia chip settings causes screen wash out after videos or heavy gaming. Its a battery saving measure while watching video or gaming but persists afterwards when it shouldn't. There's an app around here for that. Nut I'm after a color correction.

Kayak83 said:
XDA developer Supercurio has an app called screen tuning for the Samsung 10.1 that I loved that changed the white temperature, which I believe is the issue. I think an app like this would help significantly.
Its also been said that the nvidia chip settings causes screen wash out after videos or heavy gaming. Its a battery saving measure while watching video or gaming but persists afterwards when it shouldn't. There's an app around here for that. Nut I'm after a color correction.
Click to expand...
Click to collapse
The screen tuning app can only be used with AMOLED screens, which the Nexus 7 doesn't have.

Related

More bright, more tint vs less bright, less tint

Okay, everyone pretty much knows no two SAMOLED screens are the same. I recently bought a second Nexus S (because I kept hearing people say it has "amazing" battery life whereas I was getting nothing better than my Vibrant) and decided to keep my first one (I will return it later) to compare. The second NS definitely has a slightly brighter screen, but it also has a much more apparent purple tint. The first one has a slightly less bright screen but the purple tint is also very minimal, hardly noticeable unless one is looking for it.
Any suggestions on which one I should keep?
P.S. Both phones batteries behave similar so I guess everyone's definition of "amazing" is my definition of poor.
i personally hated the purple tint. if you dont mind the 'unnoticeable unless pointed out' defect, go for the one with the lower brightness. also, check your whites on both phones because mine had a problem displaying true white.
second phone definitely has "purplish" whites.
My personal preference is to have more accurate colors. If the white isn't white, it's not acceptable for me. I'd go for the less bright one, as long as it's bright enough.
Mine has a blue-ish tint when it's white... really annoying. Also there's banding when I swipe down the notification bar (the dark grey background... lots of odd colored lines). That and my oleophobic coating is wearing off, gonna exchange in a few days. I really hope I get one with a warmer tint so the white looks more white... I don't care if it's slightly less bright, it's too bright as it is right now anyway.
EDIT: Actually I just tried screen calibration under cyanogen rendering effects... using the N1 cool setting makes it a tad warmer, whites look white now, but it's SLIGHTLY less bright than before. Whatever, better colors, I like it for now until I exchange.
dinan said:
Mine has a blue-ish tint when it's white... really annoying. Also there's banding when I swipe down the notification bar (the dark grey background... lots of odd colored lines). That and my oleophobic coating is wearing off, gonna exchange in a few days. I really hope I get one with a warmer tint so the white looks more white... I don't care if it's slightly less bright, it's too bright as it is right now anyway.
EDIT: Actually I just tried screen calibration under cyanogen rendering effects... using the N1 cool setting makes it a tad warmer, whites look white now, but it's SLIGHTLY less bright than before. Whatever, better colors, I like it for now until I exchange.
Click to expand...
Click to collapse
just for you info, the blue-ish white is the actuall true white . its the better screen than the purplish white. and once you comapre them both head to head, you are gona kiss your phone.
i am not aware of your other issues but if they are annoying you, then just exchange the phone.
god knows how many weeks i searched for cool blue-ish white for my galaxy S and then iphone 4. i hate the warm yellow /purple-ish color from my heart >_< " its a friggin defect "
DarkAgent said:
Okay, everyone pretty much knows no two SAMOLED screens are the same. I recently bought a second Nexus S (because I kept hearing people say it has "amazing" battery life whereas I was getting nothing better than my Vibrant) and decided to keep my first one (I will return it later) to compare. The second NS definitely has a slightly brighter screen, but it also has a much more apparent purple tint. The first one has a slightly less bright screen but the purple tint is also very minimal, hardly noticeable unless one is looking for it.
Any suggestions on which one I should keep?
P.S. Both phones batteries behave similar so I guess everyone's definition of "amazing" is my definition of poor.
Click to expand...
Click to collapse
This is how your NS should look in your screen while in the clock homescreen . If it looks any different, then its not right. Usually there's a purplish tint in the bottom tabbed icons on the lowest bright settings. You'll want to find one thats closest to this display
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After doing the test mentioned above (Clock -> hit the brightness setting on the top right corner), I notice that the lower buttons are purple/pink tint.
Does that indicate a defective display? Also, after a few seconds, it dims even more, and the entire screen has a purple/pink tint.
Seems like some super poor quality control if there are huge variances in SAMOLED display tech coming out of Samsung... =[
justsignbythex said:
After doing the test mentioned above (Clock -> hit the brightness setting on the top right corner), I notice that the lower buttons are purple/pink tint.
Does that indicate a defective display? Also, after a few seconds, it dims even more, and the entire screen has a purple/pink tint.
Click to expand...
Click to collapse
purple = defective. bad screen
cool blue = good screen.
the end of the day = personal taste. but compare a purple screen to cool blue screen when you set the brightness to the highest on a white background. the difference is night and day
Gah, I knew there was something horribly wrong with the purple.
This is my 2nd unit and I'm not sure if I want to exchange it and take another risk of getting a faulty unit.
My first unit had a faulty back button and this one has a loose volume rocker (not too concerned about), and just found out that the screen is defective.
Now that I think of it however, I'm rarely on low brightness and high brightness.
justsignbythex said:
Gah, I knew there was something horribly wrong with the purple.
This is my 2nd unit and I'm not sure if I want to exchange it and take another risk of getting a faulty unit.
My first unit had a faulty back button and this one has a loose volume rocker (not too concerned about), and just found out that the screen is defective.
Now that I think of it however, I'm rarely on low brightness and high brightness.
Click to expand...
Click to collapse
good luck thinking about it before you go to sleep and you actually sleep.
and if you did, you will have nightmares about it
As I mentioned before, I'm not sure if this really considered a defect in the eyes of samsung because I've yet to see one displayed like the the 2 photos I've provided. I know this because of the inconsistencies I've personally seen with the N1 screens myself, and certain batches of N1 would have varying degrees of the purplish tint, some worse than others. It stills baffles me how they let this bleed over into their NS lines. My NS still has the issue but out of all the NS I've seen so far I've lucked up on the better out of the other evils.
Sent from my Nexus S
ll_l_x_l_ll said:
good luck thinking about it before you go to sleep and you actually sleep.
and if you did, you will have nightmares about it
Click to expand...
Click to collapse
As scary as it may seem, I did have nightmares about it!
I'm going to end up keeping this unit since I haven't ran into other large issues such as rebooting during phone calls, etc.

The Best Tablet Display

I just found this article written by someone who knows his stuff.
http://gizmodo.com/5824807/the-best-tablet-displays-ipad-2-just-got-dethroned
I disagree with him though as I believe the transformer has a better and brighter screen than the Ipad 2.
I have both side by side and the iPad2 is clearly brighter at max, dimmer at min, and less reflective...
Any one else notice that this page has a caption next to the results: "Click to embiggen chart" ?
How can I take an article seriously if they use words that were made up on an episode of The Simpsons. I guess they would argue that their usage was perfectly cromulent.
The best one is the one that fits your eyes.
+1
aibo said:
The best one is the one that fits your eyes.
Click to expand...
Click to collapse
Right, I almost never use max brightness.
Also Transformer has 1.3 times more the number of iPad 2 pixels.
This guy knows his stuff, so I'd not be inclined to argue with him. However, I'll say this: the screen on my TF is outstanding, regardless of whether or not some other screen is better. It's like cars: I love my Infiniti G37, even though there are demonstrably better-performing cars available. And indeed, one of the things that I love about the G37 is that I paid $15K less for it than the equivalent BMW, and have 95% of the performance. That's an equation that I can live with quite happily...
Sent from my Transformer TF101 using Tapatalk
ive seen other review of the screen(cant remember where) by a guy who knows alot about photography, he did all this measurement on the color and white balance on the k scale, and has said if your into professional photo applications the transformers screen is the best as it produces very accurate colors, also samsung had put a screen driver ontop of the tegra 2 one to over saturate colors to make the screen appear more vibrant but if your looking for image accuracy its a bad screen for that
krispy1 said:
ive seen other review of the screen(cant remember where) by a guy who knows alot about photography, he did all this measurement on the color and white balance on the k scale, and has said if your into professional photo applications the transformers screen is the best as it produces very accurate colors, also samsung had put a screen driver ontop of the tegra 2 one to over saturate colors to make the screen appear more vibrant but if your looking for image accuracy its a bad screen for that
Click to expand...
Click to collapse
I have done measurement of the transformer and iPad and find that both units have some inaccuracy, but are pretty close to the actual values when displaying a sample color panel. I would give a nod to Transformer for warmer (red and orange) colors and the iPad to colder (blues) colors. Both are miles more accurate than the Samsung which is dramatically over saturated.
My iPad's screen is too warm, and my TF's screen is too cool.
It's a bit frustrating.
krispy1 said:
ive seen other review of the screen(cant remember where) by a guy who knows alot about photography, he did all this measurement on the color and white balance on the k scale, and has said if your into professional photo applications the transformers screen is the best as it produces very accurate colors, also samsung had put a screen driver ontop of the tegra 2 one to over saturate colors to make the screen appear more vibrant but if your looking for image accuracy its a bad screen for that
Click to expand...
Click to collapse
Yeah, the color accuracy is great on this screen. It almost makes it painful to go back to my laptop.
Never have thought the TF had the best screen, way too many issues with light leak to even be considered. It looks aight though.
darkonex said:
Never have thought the TF had the best screen, way too many issues with light leak to even be considered. It looks aight though.
Click to expand...
Click to collapse
The Ipad is known for having light lead issues as well; it seems to be a "feature" of IPS panels. That does nothing, however, to detract from the fundamental quality of the screen when any light leakage isn't apparent (as in 100% of my own use, since I might have leakage but haven't even noticed it).
Sent from my Transformer TF101 using Tapatalk
Dorkington said:
My iPad's screen is too warm, and my TF's screen is too cool.
It's a bit frustrating.
Click to expand...
Click to collapse
Tablets really need to have color profiles and brightness and contrast like you do on a Mac or PC. Then you could use a hardware calibrator to create a customize profile for the specific of your own display. I do this on all my laptops and desktop monitors and the results are very nice. The only downside is the calibrator hardware and software cost $250+.
i just had my screen replaced under warranty by asus for a white spot (backlight leak).
unless i'm imagining it, the new screen seems to be warmer and not quite so bright as the one it replaced
but it also has zero light bleed at the edges where the old one had quite a bit.
perhaps they're now using a different panel than when i first bought my b60 tf101 a year ago.
has anybody else noticed any variation in screen brightness/ colour between units?
theabsurdman said:
i just had my screen replaced under warranty by asus for a white spot (backlight leak).
unless i'm imagining it, the new screen seems to be warmer and not quite so bright as the one it replaced
but it also has zero light bleed at the edges where the old one had quite a bit.
perhaps they're now using a different panel than when i first bought my b60 tf101 a year ago.
has anybody else noticed any variation in screen brightness/ colour between units?
Click to expand...
Click to collapse
Yeah Asus replaced mine too because it didn't wanna turn on. The new screen is magnificent no light bleed and yeah Asus Sammy and apple have the best screen
Sent from my HTC Sensation 4G using xda premium
I can't complaint as asus renewed my screen cause of back light leaking. Im told that apple always use too many pixels looking at there screen resolutions.
/offtopic
The battery capacities these days! Amazing !!
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I have TF101 (mid level bleed issues, I can live with them given I rarely run full brightness, never need to), iPad 1,2,3, A500, Nook Color, and a few others. IMO, ALL of the IPS displays are great, and more than safisfying. I don't compare them because I don't see the point, they are all way more than "good enough" for my and my family's casual use. If you are using these for photography or similar "on the road" and color accuracy is a concern, then you should probably get a Macbook or even better the new asus zen gen2 (which beats even the MAC displays for accuracy, check out Anand's review on the new Zen Ultrabook, drool ). My main point is, as long as your display makes you happy, who cares if there is another one out there that is better . If you are researching for a purchase on the other hand, be realistic in what your uses are going to be and read reviews that cover those uses along with reliability and customer support quality, see if you can borrow one or check one out somewhere, and let your budget and your eyes be your guide, and you will be happy with what you get.

Screen feedbacks/issues

For the current owners, especially for those who are 'extremely' particular about the screen, do you guys any screen related issues?
I've been with the Galaxy S1 and S8500, both devices used the first generation SAMOLED screen and I never had any screen related issues on both devices but as of late there's been a lot of screen issues ( mostly quality control related ) on the Galaxy S2, Galaxy Note and Galaxy Nexus..
To name a few:
- faint but visible horizontal/vertical lines visible on white/grey images
- green/blue color tint when the device is tilted with in just a few degree's
- uneven screen brightness
- suction cup rings
- blotchy/spotty blacks, you can see darker or brighter spots when the screen is displaying an entire black image - All Tab7.7's have spotty blacks, if anyone has a screen w/o spotty blacks please post it up here, it would help a lot of people.
I owned a Galaxy S2, replaced for a total of 7 times all had different screen related issues and I decided to get a refund for and got the G-Note when It came out, already had 1 screen replacement which resolved the lines issue but other screen related issues took its place, still waiting for the 3rd screen replacement to arrive and also processing a refund if they are not able to fix it.
I plan to make the Tab7.7 as my primary media device ( please spare me the 'get a plasma tv defense' ) and a web browsing device so screen quality is very important to me and most of the time it will be used at 0-10% screen brightness in a dark room (bed room).
Using the Tab in a totally dark room is nothing considered as 'extreme conditions' just because not everyone has the same usage pattern does not translate to 'extreme conditions only' situation.
Id like to ask a very honest and objective feedback from the current owners, I also understand that as of now only a few have this device. Testing in a dark room or with minimal ambient light is preferred as reflections can really skew results.
For anyone also wanting to contribute check the following images on your Tab 7.7 and put it in full screen and see if there are any uneven shades,lines or anything to report about.
This thread will get more exposure as the Tab 7.7 is slowly rolled out around the world. I would like to restate that this is purely an objective thread and not the subjective 'i dont see it in normal use' because not everyone has the same normal usage. Its not to say that all of the Tab7.7 screens are defective but Id like to see how wide spread the issue is based on XDA-Developer members. Again people, objective and not subjective.
EDIT:
For now it seems that I've gotten enough feedback and expect the very same issues from the Galaxy S2, Need a huge amount of luck for the purchase on my end.
EDIT2:
We need someone who claims that their black screen output is very uniform and does not have any spots, so far nobody has posted yet but we do see claims but these claims are not enough, for the sake of research anyone with an screen with no blotches or spots on black post up.
EDIT3: (Feb 19 2012)
After checking out and screening a total of 15 units from different stores and different dates, I've managed to see only 2 units with 'acceptable' screens. I say acceptable because I am expecting the grey rendering to be as good as on the Galaxy S and S8500. I will be getting one tomorrow but it still has a visible darker top part and lighter bottom when rendering greys.
The very common issue I've seen is a visible thick vertical/horizontal lines on the screen when rendering greys and either a yellowish or greenish discoloration at the bottom and some reddish bleeding on the edges ( mostly top ) I dont think a screen that can render greys on the Tab7.7 exists for now but Im sure it will be possible 6-8 months down the road when screen production gets better.
Different shades of greys are my objective way of testing the screen quality as it easily cuts down the time needed to do so, if a certain screen passes my objective test I goto the subjective test, Load up Thumbkeyboard and use the split lay out with the ICS theme and observe if the shades on the letters from Q to P are the same, some screens that fail the objective test actually produce good results on the subjective test, while others really give out a very obvious discoloration, also all of my tests are done with 0% brightness since thats the brightness i will be using 90% of the time, as the brightness ramps up these discolorations become less obvious.
EDIT4:
Anyone wanting to set here my suite of grey test images
http://www.mediafire.com/?hfxjz8nhymc4h4d
Crucial images are the grey-15 and grey-25, test in a room w/o any directly light or reflections from your face. 0-33% brightness.
EDIT5:
Why grey images, why all this specific settings that require planetary alignment and a virgin sacrifice, read on:-
http://forum.xda-developers.com/showpost.php?p=23529783&postcount=27
EarlZ said:
I've had mine for almost a month, no burn-in issues, Ive been using the Tab almost in portrait mode and stopped using Honeybar just to see how fast the burn-in kicks in, nothing what so ever.
I cant judge if its visible in normal use or not, unlike others I dont assume how a screen issue looks like unless I've seen it or at least pictures of the issue, this has always been the source of many arguments in forums, people just assume all screens are created equally and just because they dont see the exact same issue on their end they actually become more aggressive and hateful and they tend to find the need to keep defending the product. What gives?
Companies always add a cost buffer to cover for returns and that is usually with upto 3 returns, but complacent people just accepting obivous defects are also the cause for this level of quality control since Samsung can now get away with it, especially that some people are false advocating that there are issues thats normal to AMOLED which is incorrect.
I havent used my Tab yet as an ebook reader so Im not exactly sure what they are experiencing but the pictures posted paint a clear picture, It can be annoying at times I suppose and when a product is marketed for its great screen and deep black levels, should anything less be expected? I mean personally coming from a Galaxy S which had none of the screen issues you've mentioned, the Tab7.7's screen should be expected to be better in every single aspect, right?
I've been quite active in this forum and I haven't seen anyone report multiple exchanges yet, I didnt even exchange my Tab yet.
I dont know who you are specifically referring to but I also use greys as my test images, let me give you a little more perspective incase you made a 'selective reading' in regards to this issue.
Grey colors easily allow you to check if your getting a quality screen or not, they can easily show those lines and discolorations with out the need for using multiple test images, they give you objective results especially when your buying the device but its not very conclusive since the store light will show a lot of reflection on the screen.
Testing at 0% brightness in low light environment is also ideal for an objective testing to avoid any reflections that you might see hiding these flaws, but if one exclusively uses the device in a very bright environment then this step can be skipped.
And this is the real world perspective:
This is the original grey image:
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and it should look close to that on the tablet.. For comparison, on my Galaxy S and my former Galaxy S2 can render this color perfectly.
not something like this:
one side is darker, visible lines, dots, circle marks.
You can argue that it only affects greys but it does affect a lot of things you see on the screen and to a certain extent like this:
and when we flip the tab over we get this:
Ignore the moire, notice that one side is darker than the other.
This is how the original frame looks like:
Sure not everyone uses the Tab7.7 as a media player, remember those visible rings and spots above? Check out the attached images.
This is because reviewers hype up the black levels saying its totally black and some internet articles say that AMOLED is in an 'off' state when displaying blacks which gives us the false information and relatively ruining expectations, my first samoled device was the S8500 (Wave) and the blacks were great, no blobs or spots and it had a very faint glow, that was the foundation of my expectation which was further reinforced by the Galaxy S that gave the same results. Others may have started with the Galaxy S2 and the expectations set by reviewers so they ended up returning their devices. On my end I returned it for the yellow tint, which the technician also confirmed that it was very visible and during that time there was nothing they can do.
Sorry for the wall of text but I felt that I should be explain this thoroughly as I am very affected by the screen issues and I am very vocal about it and it did get things done on my end.
TL;DR
Bottom line is, its a $700 device with its primary feature as the screen which is advertized,marketed and specified to have the most vivid, crisp, sharp and clear images. Others are reporting that they dont have any screen issues-what-so ever so why should someone else for settle anything less?
Click to expand...
Click to collapse
the 77 has same screen as the note... but it's brightness more even across the screen.. the only problem you will have is it's size... since you're coming from Note.. you might find it hard to justified it's size... like bringing it with u anywhere.? when jogging?
I am now using my old trusty ipad2 ... which I can type like a breeze...
like I said 77 has better amoled screen that early Notes...
sectorlord said:
the 77 has same screen as the note...
Click to expand...
Click to collapse
Erm, wrong...
The Note is a PenTile display. The 7.7 is not.
The Note's PenTile arrangement uses 8 subpixels per 1 pixel.
The 7.7's SAMOLED Plus display uses 12 subpixels per 1 pixel.
I won't be brining it around for joggin of that sort, its gonna be my primary media device so it needs defect free from those random manufacturing faults.
It might be too early to ask this as probably the user count in xda is pretty small.
I'm returning one of this beacuse when reading in a dark room there are serval visible rings and spots darker than the rest of the screen.
You are only able to see it when you have a grey or black background and your eyes are adapted to the darkness.
EarlZ said:
For the current owners, especially for those who are 'extremely' particular about the screen, do you guys any screen related issues?
Click to expand...
Click to collapse
This device probably isn't for you, yet.
I just got the 7.7 and have issues. The brightness is a bit brighter along one side, and I have the dark spot issue, this time in the form of dark circles, equally spaced (probably from the glass handling suction cups or something)
On the bright side, at least I don't have any bad pixels ;/
BTW a good app for testing is the simple "Advanced task manager" app, it has a dark screen near black and these blotches are visible with this even in a room with some light.
I used my galaxy tab 7.7 for almost a month and i must say , the dark circles are truly annoying especially when you watch movies with dark scenes in a dark room with low brightness.You can hide the dark circles by increasing the brightness but it is a simple waste of battery life and its really bright in dark room. I also noticed screen burn in for the wifi and battery icon, i used my 7.7 on zero brightness since day 1 and screen burn-in still persist after 3 weeks. Good way to see the dark circles is by simply turning off the tablet, the tablet will "glow" with the dark circles after the samsung logo is gone.
[email protected] said:
I'm returning one of this beacuse when reading in a dark room there are serval visible rings and spots darker than the rest of the screen.
You are only able to see it when you have a grey or black background and your eyes are adapted to the darkness.
Click to expand...
Click to collapse
My old and new one have these rings. I'm guessing its glue or something bonding the screen to a backplate. Or an imprint of a backplate on the screen.
In any case I think this is not a problem or defect. You really must be in total darkness and viewing a black screen to see it. And even then its very hard to see.
[email protected] said:
I'm returning one of this beacuse when reading in a dark room there are serval visible rings and spots darker than the rest of the screen.
You are only able to see it when you have a grey or black background and your eyes are adapted to the darkness.
Click to expand...
Click to collapse
DaveC1964 said:
This device probably isn't for you, yet.
I just got the 7.7 and have issues. The brightness is a bit brighter along one side, and I have the dark spot issue, this time in the form of dark circles, equally spaced (probably from the glass handling suction cups or something)
On the bright side, at least I don't have any bad pixels ;/
BTW a good app for testing is the simple "Advanced task manager" app, it has a dark screen near black and these blotches are visible with this even in a room with some light.
Click to expand...
Click to collapse
randomgent said:
I used my galaxy tab 7.7 for almost a month and i must say , the dark circles are truly annoying especially when you watch movies with dark scenes in a dark room with low brightness.You can hide the dark circles by increasing the brightness but it is a simple waste of battery life and its really bright in dark room. I also noticed screen burn in for the wifi and battery icon, i used my 7.7 on zero brightness since day 1 and screen burn-in still persist after 3 weeks. Good way to see the dark circles is by simply turning off the tablet, the tablet will "glow" with the dark circles after the samsung logo is gone.
Click to expand...
Click to collapse
Thanks for the heads up, It would seem that the darker spots are quite obvious since the screen is bigger, I also had those spots on some of my Galaxy S2 replacements and I found it very unacceptable and the same with my Note.
When I was testing at the store which had the usual store lighting one unit had several visible lines in greys while the other one only had 3 lines just in the middle.
For the uneven brightness on the screen, Im pretty sensitive to that.. when I saw the HC task bar in landscape mode I immediately noticed a difference in brightness but only 1 of the 2 exhibited the issue.
The screen burn-in is a concern as Im getting the same feedback from friends who bought the unit just last week!
I understand that not all screens have this issue but the chances of getting an out of spec screen might be pretty high, wish they brought back the same quality control when the Galaxy S initially came out, which had none of these issues what so ever.
BTW a good app for testing is the simple "Advanced task manager" app, it has a dark screen near black and these blotches are visible with this even in a room with some light.
Click to expand...
Click to collapse
Do you mean advanced task killer?
reiconol said:
My old and new one have these rings. I'm guessing its glue or something bonding the screen to a backplate. Or an imprint of a backplate on the screen.
In any case I think this is not a problem or defect. You really must be in total darkness and viewing a black screen to see it. And even then its very hard to see.
Click to expand...
Click to collapse
It is a defect and a very bad one, also the visibility on this is not the same on all units. I have a suction up ring on my Galaxy Note which is visible at the 'service center lighting conditions' which the tech also saw the rings. Several pictures of this issue also posted on the various Galaxy S2 forums here in XDA under a well lit condition.
DaveC1964 said:
This device probably isn't for you, yet.
Click to expand...
Click to collapse
Seems like it until screen yields improve or I get a chance to get one w/o any of these out of spec issues.
No screen is perfect, not even the ipad screen.
Ihave a galaxy s2 and rememeber hearing all the burn in worries last year. Almost a year later now and i dont have any burn in.
The only issue ive noticed is that some pixels on oled can have a slightly differrent brightness than others due to the nature of oled. Yes my s2 has a tiny amount of pixels like that,
But you have to look at it at the wrong angle with the wrong amount of ambient light with the wrong colour on the screen to notice it.
Yes a larger screen is likely to have more issues but if it was an ips screen then we would no doubt all complain about backlight bleed.
My advice is stop looking for problems with it and enjoy your tablet otherwise you will never be happy with it !
Sent from my GT-I9100 using xda premium
crunchie-uk said:
No screen is perfect, not even the ipad screen.
Click to expand...
Click to collapse
True no screen is perfect, what I am looking for is a quality screen that is with in specification and Im more than certain there are batches of screens that will meet these requirements.
crunchie-uk said:
Ihave a galaxy s2 and rememeber hearing all the burn in worries last year. Almost a year later now and i dont have any burn in.
Click to expand...
Click to collapse
Like what you said, no perfect screen but there are some screens that are made better, A year of usage with no burn-in is fantastic! Some are getting it as early 30days from purchase.
crunchie-uk said:
The only issue ive noticed is that some pixels on oled can have a slightly differrent brightness than others due to the nature of oled. Yes my s2 has a tiny amount of pixels like that,
Click to expand...
Click to collapse
Yes to certain degree there are but they should not be noticeable to the naked eye, if its noticeable then its purely a quality control issue.
crunchie-uk said:
But you have to look at it at the wrong angle with the wrong amount of ambient light with the wrong colour on the screen to notice it.
Click to expand...
Click to collapse
Well that depends on the usage, Im not pushing my own usage to anyone as I believe not everyone watches movies or browses the web on the tab7.7 with close to 0% brightness and in total darkness. My usage revolves on that so there are no special conditions on my end. I hope this is understandable.
crunchie-uk said:
Yes a larger screen is likely to have more issues but it was an ips screen then we woukd no doubt all complsin abiut backlight bleed.
Click to expand...
Click to collapse
Yes backlight bleeding, but thank god both of the ipad2's here dont have any hint of backlight bleeding.
crunchie-uk said:
My advice is stop looking for problems with it and enjoy your tablet otherwise you will never be happy with it !
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
I do not look for these issues intentionally and I see them with my normal usage, thats why I intend to research first before taking the plunge. But I understand I might have a higher standards that others but thats just me, I want to get the most of my purchase or not purchase at all.
Long story short, all the screen issues I've found on my Galaxy S2 was due to normal usage including the yellow tinting and darker spots which annoyed the heck out of me considering the cost of the device. On the Galaxy Note I've read about the all the screen related issues even on the video issue and still said to my self 'these things should not be noticeable in normal usage' but i was wrong. So this time Im taking it slowly but I already know what to expect. But I do understand what you are trying to say.
EDIT:
I dont want anyone to mistake this as a witch hunt, I just want to know what to expect, acceptance is easier when expectations are set.
Yes, there will never be 100% perfect screens. We'd all be constantly returning devices and not actually using them because of some "defect".
I've had my S2 since it first came out in May 2011. No problems with burn-in or colour shifts. I don't expect my 7.7 to have problems either. I'm not concerned that some "defect" will manifest itself under some extreme "only if I go looking " condition.
I'm enjoying using my S2, 7.7, and Transformer for what they are - mobile devices that provide communications, entertainment, and information.
Agreed I can also accept defects as long as I dont see them with my usage. Example between my SGS2 vs Galaxy Note which shared a common issue on the darker spots but it was more obvious on the SGS2 since it was a horrible pattern while on the Galaxy Note its tiny and multiple spots.
Every defect is different and we should not all assume that they are all acceptable to everyone.
reiconol said:
I'm not concerned that some "defect" will manifest itself under some extreme "only if I go looking " condition.QUOTE]
May be for you it's an extreme situation, but in my case, I bought this tablet for reading ebooks at bed (among other things) and I use white text over black background, so I am in that "extreme situation" on a daily basis.
I also have a Galaxy Nexus and that screen also have one line and some dots, but since my usage pattern is not the same it don't bothers because I really dont see it. But in the case of the tablet, I had to convince myself that I had paid a big amount of money to receive a screen with what for me is a defect.
I was the owner of a Huawei Ideos S7-105 (I now miss it) and appart from the battery and several other small annoyances I was pretty happy with it, I paid 150€ for it so I got what I paid for, but the 7.7 costs 450€ so my level of exigence is higher.
Sad thing abot all of this is that the other tablet that could be an option (Xoom 2 8.2) seems to bee plently of issues as well.
Click to expand...
Click to collapse
[email protected] said:
May be for you it's an extreme situation, but in my case, I bought this tablet for reading ebooks at bed (among other things) and I use white text over black background, so I am in that "extreme situation" on a daily basis.
Click to expand...
Click to collapse
This is always the case, people who dont have the same usage pattern nor with the same issue will never understand. But its been my understanding that this is already 'common' (but not normal) among amongst the hd samoled and samoled plus.
[email protected] said:
Sad thing abot all of this is that the other tablet that could be an option (Xoom 2 8.2) seems to bee plently of issues as well.
Click to expand...
Click to collapse
Yes the other alternatives that I've been looking are also riddled with issues, come to think of it only samsung has the least issues based on my research.
I've seen the concerns on other AMOLED devices Earlz mentions as well.
It's not a deal beaker but you may want to keep a LCD device around for reading at night.
No use exchanging numerous times hoping for a perfect screen.
Right now while AMOLED is a very dramatic screen tech
but it's not at its best with low brightness levels,
and certain test patterns / images reveal other side effects .
For reading in the dark a screen like the iPad 2's IPS LCD is probably a better choice.
It offers a very low brightness level with consistent results.
I think the key is to use AMOLED devices where they perform best,
at higher brightness levels during the day.
In that scenario if you hand a iPad 2 and AMOLED device
to the average person they will be floored with the AMOLED screen.
I don't have any issue on low brightness level.
I always operate my 7.7 at ~0-20% brightness.
Did anyone test the screen using the screen test apps? I tested mine and I have yellowish patch at the bottom part of the screen. It's only visible in dim grey. Luckily there is no dead pixel but my screen start to squeak a little when press at the bottom corner. The quality control is really bad. I'm waiting for a engineering revision before going for warranty claim. I must say I'm disappointed.
Sent from my GT-P6800 using XDA App
earthman5678 said:
Did anyone test the screen using the screen test apps? I tested mine and I have yellowish patch at the bottom part of the screen. It's only visible in dim grey. Luckily there is no dead pixel but my screen start to squeak a little when press at the bottom corner. The quality control is really bad. I'm waiting for a engineering revision before going for warranty claim. I must say I'm disappointed.
Sent from my GT-P6800 using XDA App
Click to expand...
Click to collapse
There's been a few reports from here and another forum that the screen seems to squeak or dislodge a bit on the bottom corner.
@SonicTab:
I went for an amoled screen beause it's suposed that when screen is black pixels are off and there should be no light emiting so in my case, when reading in the dark I should only see the text, and not a bluish black background as every other LCD based screen
@GOF007:
You are either lucky or do not use the tablet in the same conditions as I do. Did you test it viewing one of the pictures in the first post in a dark room?
I really hope my case where just bad luck and be given another tablet whitout those screen issues, or at least with something less annoying.

Yellow tint on S4 screen

I have this annoying yellow tint on my S4's screen, but disappears when the phone is tilted over 45 degrees. Is this faulty ? Shall I return it ? Or is there a way I can fix the gamma through an app without rooting the phone ?
Brightness set on full
Auto-tone, Auto-brightness disabled
Screen settings set as standard
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I have this too, interested if this is a defect or just the colour tone of the amoled on the gs4
I have the S2 and it's blue compared to my display on computer, and I don't even notice it unless I put it against the computer display like you did.
Maybe try other display calibration, I hear you can change them.
Ok, been doing some google research on this -
There's always going to be a slight yellow tint to the particular amoled screen used in the GS4. However, to reduce the effect, set your screen mode to MOVIE.
Movie mode provides the best colour accuracy and also white point of the available choices. I can confirm this is the case having just spent a few minutes comparing colour charts to my girlfriend's very well-calibrated iphone 5.
So I would set it to MOVIE. The whites still won't be IPS display white, but then IPS can't touch the beautiful blacks on amoled. Horses for courses. Hope this helps.
@paddlyaz can you provide sources of where you got this info ? -- Edit : I just tried it, all that did was make the display washed off..Yellow tint still visible
It may LOOK washed out to you - but this is an AMOLED display, which is naturally very colour saturated.
If you compare the gs4 to an iphone 5 like I did just now, you'll see that even in Movie mode, the colours are a little MORE saturated than even the iphone 5 has to offer. The tint is a side-effect of this. IPS displays like the iphone may offer truer whites but amoled displays like the gs4 destroy them in terms of saturation and black levels.
It all depends on what you prefer on a phone.
In terms of the GS4, some people find the 'dynamic' and 'standard' modes vibrant and eye-pleasing - but they're not at all accurate and will exaggerated, innaccurate representations of your photos, videos etc. I have one photo of me in a yellow jumper (fashion mistake I know). When I have it on 'standard' it looks like I just came back from a two week holiday in Chernobyl. In movie mode, it looks exactly how it looks in real-life (i.e. still disgusting but accurate).
Here are a couple of links that describe it more:
http://www.gsmarena.com/displaymate_tests_galaxy_s4_screen_gives_it_the_thumbs_up-news-5928.php
http://gizmodo.com/5995376/galaxy-s-iv-display-shoot+out-how-does-it-compare
I wish I have another camera to show you the difference between my iPhone and S4 ... The iPhone's screen is bright white compared to the yellow tint on my S4. If this is a "feature" then it's not really efficient now is it =\
Maybe there is a way I can manually edit the gamma, this should fix the problem I guess. Or just exchange it for another one.
did you read ANY of my post?!
It's the trade off you pay for having perfect black levels and saturated colours.
The only way you're ever going to see perfect whites is if you get an iphone/htc one - e.g. an IPS display.
But then you're going to be stuck with 'blacks' that are actually grey. And that SUCKS.
People have differing opinions on which trade-off they'd rather have. Personally I'll take a slightly 'warmer' screen in return for having deep, inky blacks.
Hmm I see, so the display type is the reason why the yellow tint appears eh ? Interesting, thanks for the links too, going to check them out.
all screens will be slightly different from each other - but yes, amoled screens will almost always have either a slight YELLOW tint, or a slight BLUE tint - in other words, a slight exaggeration of one particular tone. If you have the time, do a google search and you'll see this was a common 'issue' flagged up on both the gs3 and gs2.
Your best bet is to do the following:
-set screen mode to MOVIE
-disable 'auto adjust screen tone'
-disable auto brightness.
You will never EVER see perfect whites on an amoled screen, and anyone who tells you they have them is lying out of their arse. Most reviews for the GS4 and also in the articles I linked you state that the GS4 is the most accurate amoled screen so far though.
If still disappointed, your best bet is the iphone5/htc one/nexus 4 etc
I think having an exaggerated blue tone is better than a yellow tone, in my own opinion.
Anyone else having this issue ?
I noticed this playing around with the S4 in the store. Still, much better than the S3 white point.
bad yellow tint
Hi everyone,
I received my s4 last week and found it yellowish as well. I have read everything regarding the screen yellow tint and the fact that it's because of the type of screen. I was going to give up but my girlfriend got one today as well and the comparison is very clear: her whites are so much better!
I have tried to take photos of them, and it looks greenish on the shots but you can see the difference. FYI the screen are both using the same settings: auto brightness off, brightness at the maximum, both screen mode in adapt display (I have tried the movie mode without noticing a change).
Mine is on the right if you couldn't see. You can clearly see the difference in the colour and the quality of the screen. I also noticed that the viewing angle are way worse on mine, the phone takes a greenish colour.
Finally I have very strong smearing/ghosting as soon as the screen background is black. For example when I am in the settings, if I scroll up and down, the thin lines separating the sections actually disappear whilst the menu scrolls. The thicker separator get a purple line until the scolling stops. Once again, the smearing on my girlfriend's phone is existant but much less strong. The thin separators are still visible even while the phone is scrolling.
I am definitely bringing it back to the store tomorrow. I am very disappointed with the screen even though the phone is great. I wouldn't change for a One, just for a good one.
Light_Addict said:
Hi everyone,
I received my s4 last week and found yellowish as well. I have read everything regarding the screen yellow tint and the fact that it's a because of the type of screen. I was going to give up but my girlfriend got one today as well and the comparison is very clear: her whites are so much better!
I have tried to take photos of them, and it looks greenish on the shots but you can see the difference. FYI the screen are both using the same settings: auto brightness off, brightness at the maximum, both screen mode in adapt display (I have tried the movie mode without noticing a change).
Mine is on the right if you couldn't see. You can clearly see the difference in the colour and the quality of the screen. I also noticed that the viewing angle are way worse on mine, the phone takes a greenish colour.
Finally I have very strong smearing/ghosting as soon as th screen background is black. For example when I am in the settings, when I scroll up and down, the thin line seperating the sections actually disappear whilst the menu scrolls. The thicker separator get a purple line until the scolling stops. Once again, the smearing on my girlfriend's phone is existant but much less strong. The thin separators are still visible even while the phone is scrolling.
I am definitely bringing it back to the store tomorrow. I am very disappointed with the screen even though the phone is great. I wouldn't change for a One, just for a good one.
Click to expand...
Click to collapse
This is exactly my problem, let me know what happens with you !
ZaZu90 said:
This is exactly my problem, let me know what happens with you !
Click to expand...
Click to collapse
I had the same yellow tint on screen and tried a few different firmwares thinking maybe its a software issue but nothing fixed it.
Picked up a new s4 last night and this one is perfect. The thing I noticed is the new one is assenbled in Vietnam and the old one
was assembled in China. Over all the build quality on the new one feels much better along with audio quality.
Maybe a quality control issues in some factories
Cheers
farhanali_ said:
I had the same yellow tint on screen and tried a few different firmwares thinking maybe its a software issue but nothing fixed it.
Picked up a new s4 last night and this one is perfect. The thing I noticed is the new one is assenbled in Vietnam and the old one
was assembled in China. Over all the build quality on the new one feels much better along with audio quality.
Maybe a quality control issues in some factories
Cheers
Click to expand...
Click to collapse
Where does it say the location of assembly ? I want to see where mine is. Also, did you exchange your phone for a new one ? How did you convince them it was faulty ?
ZaZu90 said:
Where does it say the location of assembly ? I want to see where mine is. Also, did you exchange your phone for a new one ? How did you convince them it was faulty ?
Click to expand...
Click to collapse
You'll see it when you pull the battery, there should be a sticker there.
I am located in Toronto and we dont have any samsung stores here
so i actually bought another one from this dealer i found on kijiji.
The new one was sealed and its from Hong Kong (but assembled in Vietnam)
Cheers
farhanali_ said:
You'll see it when you pull the battery, there should be a sticker there.
I am located in Toronto and we dont have any samsung stores here
so i actually bought another one from this dealer i found on kijiji.
The new one was sealed and its from Hong Kong (but assembled in Vietnam)
Cheers
Click to expand...
Click to collapse
I looked at mine and it says made in Vietnam... But I would agree to say that there is a problem with quality control overall. My guess is that they need to produce as much as possible to avoid any shortage. I had the same problem with my Note 1 and could be bothered to change it, this time I won't let it go.
I will keep you posted.
Light_Addict said:
I looked at mine and it says made in Vietnam... But I would agree to say that there is a problem with quality control overall. My guess is that they need to produce as much as possible to avoid any shortage. I had the same problem with my Note 1 and could be bothered to change it, this time I won't let it go.
I will keep you posted.
Click to expand...
Click to collapse
I had to go to another branch and thankfully they had a model with a white tone screen. I compared it there and they did indeed see the yellow-tone in my phone. I am getting a refund soon, it's not really worth all this trouble i'm fed up of the customer service experience with Samsung.

Nexus 5X: Display Color Calibration Thread

Now that we have our first custom kernel available (Thanks @flar2). We can now adjust the display color settings on the 5X. This will come in VERY handy for those who feel that the screen on their 5X is too yellow. It will also allow you to make tweaks to saturation, contrast, etc. to correct the lackluster color depth that the factory settings provide.
There are plenty of app options for performing these tweaks, but the two below are confirmed to be currently working on the 5X:
KCal Color Control (XDA Link)
EX Kernel Manager (Play Store Link)
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EDIT: It turns out I had a bad device with a yellow tinted display. I've since RMA'd it for one with a MUCH whiter display. So the below color settings won't be ideal for those who did get a good screen on their device.
**Comparison pics of the old screen vs new screen in post #35
Color calibrations used with my previous (yellow display) 5X. If you have a yellower display, these will be good for you:
Red: 235
Green: 245
Blue: 256
Saturation: 50
Value: 130
Contrast: 130
I've spent some time calibrating my new, much whiter screen. They are very close to the settings szucsgf mentioned below in the comments with some more saturation:
Red: 246
Green: 250
Blue: 256
Saturation: 50
Value: 130
Contrast: 130
Feel free to post your results so we can compile some of the best settings here.
Thanks for posting this! How did you pick your values? Did you compare to a calibrated color chart, like the kind used by photographers? Or did you use a colorimeter?
I just eye balled it with the phone sitting next to my iPhone 6S and color calibrated Nexus 6. I was able to eliminate the yellow hue completely and make the blacks much deeper. I know other members here use colorimeters and other tools for more accurate adjustment, so I imagine in time they will chime in with much better calibrations. But for now, my settings are a good starting point to at least eliminate the yellow (warm) hue the screen has by default.
sn0warmy said:
I just eye balled it with the phone sitting next to my iPhone 6S and color calibrated Nexus 6. I was able to eliminate the yellow hue completely and make the blacks much deeper. I know other members here use colorimeters and other tools for more accurate adjustment, so I imagine in time they will chime in with much better calibrations. But for now, my settings are a good starting point to at least eliminate the yellow (warm) hue the screen has by default.
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Thanks for the explanation iphones do tend to be calibrated pretty well, but eyeballing it isn't the most accurate method. It'll help get the color balance, but probably not the white, black, or grey points.
As a photographer, I'm actually pretty happy with the warmth in the screen. I find most monitors and phones to be super cool (blue) and that they make my photos look way worse than the originals.
Nice eye ball settings! Looking forward to comparing yours to more "scientific" numbers
sn0warmy said:
I just eye balled it with the phone sitting next to my iPhone 6S and color calibrated Nexus 6. I was able to eliminate the yellow hue completely and make the blacks much deeper. I know other members here use colorimeters and other tools for more accurate adjustment, so I imagine in time they will chime in with much better calibrations. But for now, my settings are a good starting point to at least eliminate the yellow (warm) hue the screen has by default.
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iphones are calibrated with a white point around 7000-7200K, which is slightly blue. While many find that visually appealing, it's not quite 'accurate.' 6500K is the target for an accurate white point and phonearena measured the 5x at a white point of 6799K. I've found that while the screen may not look as cool when next to other phones, pictures on the 5x look damn good
I think some issues with 'yellow' screens may have more to do with panels having brightness problems
I presume root is needed for both of the apps?
What's the best way to do this without root? Recommend an app?
XPERIA Z5 GREEN
Root is absolutely required.
Sent from my Nexus 5X using Tapatalk
0.0 said:
I presume root is needed for both of the apps?
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Root is required to flash a kernel that allows for these color calibrations. So, in turn, root is also required to use the apps required to make these adjustments.
Jooosty said:
What's the best way to do this without root? Recommend an app?
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If you don't want to root, there are apps you can use to apply an overlay on the screen to eliminate the yellow (warm) hue.
One app I used previously is:
https://play.google.com/store/apps/details?id=com.netmanslab.sa
With that app I found that if you leave everything as is and just turn Blue up +10 - +15 it eliminates the warm hue. However, this is simply adding a layer of blue and not truly calibrating the screen. So I still recommend, to those who want to do it right, that you root and use a custom recovery to properly calibrate the screen.
It's actually quite annoying that Google doesn't allow people to make these calibrations in stock configuration without rooting, but that's a whole different topic.
sn0warmy said:
Now that we have our first custom kernel available (Thanks @flar2). We can now adjust the display color settings on the 5X. This will come in VERY handy for those who feel that the screen on their 5X is too yellow. It will also allow you to make tweaks to saturation, contrast, etc. to correct the lackluster color depth that the factory settings provide.
There are plenty of app options for performing these tweaks, but the below two are confirmed to be currently working on the 5X:
KCal Color Control (XDA Link)
EX Kernel Manager (Play Store Link)
I'm currently using the following settings, which mimic the display on my iPhone 6S nicely, while being just a hint more "warm" to make it easier on the eyes.
Red: 235
Green: 245
Blue: 256
Saturation: 50
Value: 130
Contrast: 130
Feel free to post your results so we can compile some of the best settings here.
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Hey your colors are pretty nice! I like the whiter look on the phone and this is good. Will be using it for some time, thanks!
I notice the OP mentions the yellow-ish tint on the display. Google is actually replacing for this particular issue- My first 5X had an issue with the receiver so call quality sucked and the one I just got in the mail has a very warm hue to it, between red and yellow and after a phone call they are sending me another one.
Can anyone with a color sensor/calibrator calibrate for true white?
True white according to the sensor is usually a lot more yellow than people are used to. I know where are values out for my computer monitor and I was surprised.
I think for the most part, my Nexus 5x is closer to true white than the really cool whites that my M7 had. Though it's warmer than true white on comparison.
I might be try comparing the two and color calibrating based on comparison of whites to my monitor. (My monitor has color calibration settings based on the same model. I do not have my own color colorimeter, it's not worth it since I don't do any kind of media work)
Edit - I didn't end up installing the kernel because I wanted to keep systemless root, and I don't think that was included with the boot.img
However, I do have CF Lumen working and I used the color filter to acheive (reasonably/humanly) close results.
CF Lumen uses a color filter in from 0-1, where 1 represents 100% of the respective RGB value and 0 filters out all of the respective color. Since the colors are appearing anywhere from yellow to more orange-ish hue, I set R to .969 and G to .929 with B at 1.. You can translate that to the results you want in color control by multiplying these decimals with the maximum possible value ( For example R should be 256 * .969) The increment of change isn't as fine as I'd like, but what are you gonna do, it's just a phone. Most phones don't even come close to true white anyway.
I want to also note that your results will vary, probably. These are values for my phone. They're a good starting point. There seems to be reports of huge variations of yellow screens, with some people (placebo? eyes getting used to it) saying it has resolved over a week or two.
Again, most people used to default LED/LCD screen white will even think this calibration is too yellow. Colorimeter calibrations always calibrate for the accepted true white, and therefore will seem warmer than what most people are used to, which is a very cool white. As long as your eyes are happy, there's really no issue I guess. However, I would like to point out that true white is really a lot easier on the eyes than the cooler white that most phones have these days. Blue colors to the eyes seem to "scatter" more and human vision has a harder time focusing with bluer colors. On the other hand if things become to warm, it becomes hard to distinguish things from one another. That's why at night time, or dark conditions, CF lumen is set to warmer colors because at night time vision in the eye has much less ability to contrast and distinguish, and relies more on things like outlines, and movement. (How many times were you driving at night and didn't realize something (deer!) was there until it moved?) Bluer light (most scientifically it's Green, but blue does a good job too) activates cones, and shuts down night vision, blue light is perceived to scatter more and is harder to look at the screen at night, while retaining night vision.
if i install the custom kernel and calibrate the screen, then restore to stock kernel does the screen remain calibrated?
electric0ant said:
if i install the custom kernel and calibrate the screen, then restore to stock kernel does the screen remain calibrated?
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Click to collapse
Nope.
Zach1928 said:
I notice the OP mentions the yellow-ish tint on the display. Google is actually replacing for this particular issue- My first 5X had an issue with the receiver so call quality sucked and the one I just got in the mail has a very warm hue to it, between red and yellow and after a phone call they are sending me another one.
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Click to collapse
You're talking about something completely different. Nexus devices are known for having a warmer (yellower) hue right out of the box due to lack of display color calibration. Unfortunately, with the 5X, some people are receiving phones with excessively yellow displays. In those cases, Google is replacing those defective devices. This thread is referring to color calibration for screens that are not defective as they still tend to have a warmer hue to them. Some prefer the warmer hue, some don't. That's why this thread exists so people can refer to it to calibrate their screen to their liking. There is no "one size fits all" solution.
sn0warmy said:
Nope.
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thanks, so the screen calibration is managed by the kernel then.
then with the custom kernel installed, what happens with updates? do OTA updates still work?
electric0ant said:
thanks, so the screen calibration is managed by the kernel then.
then with the custom kernel installed, what happens with updates? do OTA updates still work?
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The screen calibration is managed by the app. But the custom kernel allows for this calibration. If you uninstall the app and reboot the phone, your screen calibration will go back to factory settings.
As far as non-color calibration related questions (such as root and OTAs) please take that to another thread or feel free to PM me. I'm afraid this thread is getting side tracked very fast and I'd like to keep it on topic with comments regarding color calibration tweaking.
sn0warmy said:
Nope.
You're talking about something completely different. Nexus devices are known for having a warmer (yellower) hue right out of the box due to lack of display color calibration. Unfortunately, with the 5X, some people are receiving phones with excessively yellow displays. In those cases, Google is replacing those defective devices. This thread is referring to color calibration for screens that are not defective as they still tend to have a warmer hue to them. Some prefer the warmer hue, some don't. That's why this thread exists so people can refer to it to calibrate their screen to their liking. There is no "one size fits all" solution.
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Interesting. All I know is the replacement I got is night and day from the first one and Google is replacing it (didn't even require the picture I took of the two). 3 people I sent it to commented on the difference between the two, favoring the first one.
Zach1928 said:
Interesting. All I know is the replacement I got is night and day from the first one and Google is replacing it (didn't even require the picture I took of the two). 3 people I sent it to commented on the difference between the two, favoring the first one.
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You got pretty lucky then, there are reports of people getting replacements and the color hue was worse. There really wasn't any control checks with the display color calibration in this case.
Big disappointment.
formula91 said:
You got pretty lucky then, there are reports of people getting replacements and the color hue was worse. There really wasn't any control checks with the display color calibration in this case.
Big disappointment.
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Fingers crossed I get a better one, I really like the phone. At least they aren't pulling a OnePlus and insisting a) you're crazy or b) it's supposed to be piss-yellow. Haven't spent more than 15 minutes on the phone with them in either case

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