Develop Bugs

Color temperature calibration?

Does anyone know if there are any working ways to adjust color temperature? I think most methods require a modified surfaceflinger library. My screen is sickeningly bluish green.
Thanks.

ffolkes said:
Does anyone know if there are any working ways to adjust color temperature? I think most methods require a modified surfaceflinger library. My screen is sickeningly bluish green.
Thanks.
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Sounds like a bad screen. I'd take it back. Mine is very balanced. Super saturated but very balanced.
Sent from my SPH-D710 using XDA App

I agree, my first one had a bad screen and a dead pixel right in the center, the screen quality on my new one is better all around and I wasn't even expecting there to be an improvement

Thanks for the suggestions, but the other ones I've seen don't look any better in terms of their greenish-blue color cast. I've read it's typical of AMOLED displays. I just want a way to adjust white balance like CM has.

...and I've discovered the answer. Chainfire3D's Pro version has support for Custom color "nightvision mode". Basically, exactly what I wanted. It works perfectly! Do yourself a favor and get this and drop your green and blue levels down a tiny bit.

You just saved me a two hour drive to get a new phone. Great find.

[Q] Ugly smudges on screen. Warranty return?

Hi everybody.
I bought my Nexus in December, and some time ago I noticed that screen looks ugly on certain backgrounds, mainly gray ones. So I did a little investigation and it turned out that I was right: picture looks mostly okay on primary colors, but grays shows terrible smudging. I took a photo of it. Do you think it qualifies for a warranty repair? Any of you noticed something like that?
I attach a photo, it's out of focus on purpose, because otherwise there would be a rainbow goo on screen.

The screen doesn't look good at lower light with certain colors that's just how it is..
The smudges look like someone wiped the screen with their thumb.

Screen was cleaned before taking photo. This rainbow effect is more or less visible on any background, but gray is especially bad. Even scrolling webpages is a bit annoying, because starting from top there is a pinkish stripe, then normal, then pinkish again... Yuck.

i have the exact same problem! Gray and white is the worst, and lower backlight is worse. But I realized this is mainly the glass top's fault, while i scroll a page, i can see those sumdges staying in the same spot!, don't know whether a protecting film will help or not.

joshdu1125 so I'm not alone then. I had a protective film on screen until yesterday and removed it because I hoped it was it's fault. Turned out it's not. Contacted Samsung via email, wonder what they will say.

Handtec said that some of the first phones (first batches) have worse displays than newer batches. I already sent my phone to them to be replaced.
Sent from my Galaxy Nexus using Tapatalk

screen issue
looks like its more or less same problem experienced by G.Note user, like myself..
G.Note Screen Problem Thread
try get "screen filter" from market and lower the intensity of color to let says 30%, check that same grey image, how does it look?..
My screen is much worse than urs if u wanna see... =.="
I am starting to think this problem is universal to all Samsung devices.. Zzzz

unfortunatey this is a problem with all samsung devices i suggest getting a kernel with color control such as francos or glados. its a lot better then the color control filter app and runs super smooth , francos kernel also pretty much doubled my battery life.

rey5757 you are right, less brightness = problem more exacerbated. I you have a photo of your screen, let us see it.
amcmearty I'm using Franco's kernel right now, but tried others too, to no avail.

Sorensonn said:
rey5757 you are right, less brightness = problem more exacerbated. I you have a photo of your screen, let us see it.
amcmearty I'm using Franco's kernel right now, but tried others too, to no avail.
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just go to G.Note thread in my last post, at page 65. I don even have to take "out of focus" photo to see it.

This is a problem with the screen at lower brightness levels.. it happens to just about everyone that greys and whites look bad.
Sent from my Galaxy Nexus using xda premium

My phone also has the red stripe, and white is not uniform.

joshnichols189 said:
This is a problem with the screen at lower brightness levels.. it happens to just about everyone that greys and whites look bad.
Sent from my Galaxy Nexus using xda premium
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I doubt that Everyone is affected by this, some people claims they have perfect screen on the other thread.
Setito said:
My phone also has the red stripe, and white is not uniform.
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The problem with this shadow thingy is that is varies greatly on difference screen.
The "Size", "Darkness", "Area" of shadow are INconsistent. Some screen have shadow on top area of screen, some have it at corners, some have it at lower bottom, some have it all over half or screen. Then some have it but barely visible(maybe this fall in perfect screen category), some have it but extremely obvious..
How is all these random quality screen fly out of Samsung?..

joshnichols189 said:
This is a problem with the screen at lower brightness levels.. it happens to just about everyone that greys and whites look bad.
Sent from my Galaxy Nexus using xda premium
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Found a perfect SCREEN which is Balanced at 0% brightness + 20% color intensity(screen filter):
http://forum.xda-developers.com/showthread.php?p=21436956#post21436956
This is what a super amoled display should be.
compare his to urs...

rey5757 said:
I doubt that Everyone is affected by this, some people claims they have perfect screen on the other thread.
The problem with this shadow thingy is that is varies greatly on difference screen.
The "Size", "Darkness", "Area" of shadow are INconsistent. Some screen have shadow on top area of screen, some have it at corners, some have it at lower bottom, some have it all over half or screen. Then some have it but barely visible(maybe this fall in perfect screen category), some have it but extremely obvious..
How is all these random quality screen fly out of Samsung?..
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Click to collapse
¿Samsung? No thanks: P

[Q] Galaxy Nexus screen is Super Amoled or not ?

Hi all. Few days ago, i've made a pure black image on my PC and set it as wallpaper on my Gnex. But when i view that photo in gallery (in full screen mod) i realize that screen is not 100% black, it's super strong gray but not black. I'm confuse that the screen is really Super AMOLED or a kind of LCD?

Its superamoled
Sent from my Galaxy Nexus using xda premium

Although its true that in theory there would be no backlight for an OLED screen, there is still a small amount of current that goes through just below the threshold of on/off for no lag when going from black to something else. Unfortunatly, the tjreshold will not be common for every led, so some leds will be lit. Thats what produces the small backlight even when displaying true black

Its super amoled (or amoled HD or whatever they call it) and is able to produce true black.
Xda dark theme shows no color difference between it and the nav buttons on the bottom.

Emhalwis said:
Its super amoled (or amoled HD or whatever they call it) and is able to produce true black.
Xda dark theme shows no color difference between it and the nav buttons on the bottom.
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There is no difference because the soft buttons are part of the display. Turn off the lights and you will see the entire 4.65" display glow a dark grey. It's a bit of a disappointment actually, I have a Samsung focus and galaxy S2 and the displays are BLACK. Side by side you can definitely see the difference, in the dark I cannot even find my Focus, the nexus on the other hand glows bright enough to notice.
You guys need to remember also that this is a PENTILE display, in order to get the 720P res, Samsung went with a pentile display. There is a big difference between the Super AMOLED displays on the other samsung devices and the nexus. The not really pure black blacks is one of the cons of the nexus' pentile display along with a slight yellow hue, viewing angle and a few others covered in many online articles.
Don't get me wrong, the display is still very beautifull in comparioson to most other phones. The resolution is amazing, I played a 4.2GB MKV of Avatar with MX player and it played flawlessly and the full screen (4.65") video was gigantic and absolutely crisp. But it's still not the AMOLED that Samsung customers are used to seeing.

so pentile or not if it displays black all led is turned off and thus dark no?
i understand pentile may affect other color reproduction but true black must be true black coz led is turned off right?
my previous phones were a gs2 and vibrant, blacks are blacks on all of them including this gnex
Sent from my Galaxy Nexus using Tapatalk

It's a PenTile Super AMOLED screen. This is as opposed to the Galaxy S II and Droid Charge which use Super AMOLED+ screens-- which use the traditional RGB stripe sub-pixel arrangement.
Looking at the button bar in the dark on my gnex, I can safely say mine is true black.
Sent from my Galaxy Nexus using xda premium

No. Like the guy before said, there need to be still a low current on the display so that there would be no lag when switching from black to other colors because it takes longer to switch on the display than changing the color.
Sent from my Galaxy Nexus using XDA

For some reason these new HD amoled screens aren't showing total black like previous amoled screens. There are already threads we talked about theorizing why this is. Put next to the nexus one or galaxy s and its not as black. Perhaps its due to higher pixel density, or maybe a change in the technology. But you're not alone, just have to live with it.

RogerPodacter said:
For some reason these new HD amoled screens aren't showing total black like previous amoled screens. There are already threads we talked about theorizing why this is. Put next to the nexus one or galaxy s and its not as black. Perhaps its due to higher pixel density, or maybe a change in the technology. But you're not alone, just have to live with it.
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Put the phone next to a Note and you'll cry foul. Colors, brightness, and everything look like crap when held side-by-side.

jonathan3579 said:
Put the phone next to a Note and you'll cry foul. Colors, brightness, and everything look like crap when held side-by-side.
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I don't get it, since they are using the same screen (except the resolution), shouldn't they be the same?

There are some defective screens out there.
My blacks are black. Not grey, not almost black.
Black.

Is pure dark so important? How often we stare at our phone with a pure dark picture in a pure dark room?

Amowagou said:
Is pure dark so important? How often we stare at our phone with a pure dark picture in a pure dark room?
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It's more of saving battery. When it's pure dark, the individual OLED's are almost completely turned off. I say almost because some current still runs through it but nothing like what an LCD would.
And it's better for contrast?

Another moment of everything is amazing but nobody is happy.
--------+++--------
iphone. helping computer illiteracy become popular since 2007.

@rbiter said:
Another moment of everything is amazing but nobody is happy.
--------+++--------
iphone. helping computer illiteracy become popular since 2007.
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LOL. Best. Comedian. On. This. Planet. Period.
Sent from my Galaxy Nexus using XDA

nexicon said:
LOL. Best. Comedian. On. This. Planet. Period.
Sent from my Galaxy Nexus using XDA
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LOL.
Learn to type, that is annoying. If that was an intentional lulz, you failed.

The blacks are pretty damn black on my phone, comparing with my gs2 if anything its just as black?
Sent from my Galaxy Nexus using XDA

Higher resolution will most likely result in more possible backlight from true black. (Because of the greater amount of leds being over the threshold)
And i cant says my screen is totally absent of any light, but it is damn friggen close.

Any AMOLED screen will beat the crap out of LCDs. The contrast is an order of magnitude higher thanks to the screen generating its own light, thus being able to shut down fully (or almost fully) to provide no light.
Why do you complain that there is a minuscule amount of current going through the current with a barely noticeable in pitch black amount of light being emitted, when any other screen will be VERY noticeable at night when displaying black?! This phone's screen is amazing. Yes, it's not perfect, but it's better than most (all?) other phones' screens out there. You know, screw that, this thing is probably SEVERAL THOUSAND TIMES BETTER THAN THE MONITOR YOU ARE CURRENTLY STARING AT.

[Q] White balance tweak ?? (SM- T705)

Hello ..., is there any way to tweak the white balance ? I just got my tablet, it' s amazing by the way, but i want to make the white color a little bit cooler! Thanks!!

johnpaok said:
Hello ..., is there any way to tweak the white balance ? I just got my tablet, it' s amazing by the way, but i want to make the white color a little bit cooler! Thanks!!
Click to expand...
Click to collapse
It is possible by adjusting color temperature by by available yet atm

ykkfive said:
It is possible by adjusting color temperature by by available yet atm
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Click to collapse
Can you explain to me how i can do the adjustment?
Do i need to root the tablet or from the menu? (The only tweak i found from menu is the color profiles : amoled basic, amoled cinema, etc) I have a sony xperia phone and it has an option to adjust the white balance with a slider!
Thanks..

johnpaok said:
Can you explain to me how i can do the adjustment?
Do i need to root the tablet or from the menu? (The only tweak i found from menu is the color profiles : amoled basic, amoled cinema, etc) I have a sony xperia phone and it has an option to adjust the white balance with a slider!
Thanks..
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needs kernel support, so be patient and wait until someone make it

Today I got two 8.4 Tabs, both wifi only versions in my hands and I was impressed, that the white color was different. Sadly, the whites on mine were a little bit more yellowish, warmer, and a little bit dirtier. Is this normal for samoled?

Frantic_kr said:
Today I got two 8.4 Tabs, both wifi only versions in my hands and I was impressed, that the white color was different. Sadly, the whites on mine were a little bit more yellowish, warmer, and a little bit dirtier. Is this normal for samoled?
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my experiences tell not all screens produce the same color, some are yellowish, while others are slightly blue, which can make white color a bit grey, etc
once i wanted to buy a note2 but i found its so bluish and therefore no deal
so each time I buy a phone, esp amoled, I will check the screen (and other things of coz) before I pay

I currently have 2 Galaxy Tab has 10.5 inch at home and deciding which one to keep. The main difference between the two is that one has a newer build date and love one screen seems to be a little more orange brown tint to the white versus the other tablet seems to be a little more blue yellow intent. Other than that perform identically however I did notice that when I run the CPU temperature app that the one with the yellow blue tinted screen seems to run a few degrees cooler most of the time except when using Chrome when where the other tablet seems to run several degrees cooler but only when JavaScript is activated.
One little trick in addition to adjusting the temperature using the adaptive display were changing from AMOLED basic to Evelyn cinema to make it cooler, is to go into the accessibility settings and then go into divisions section and then go into the area where one can do a test of their color as if they needed adjustments because of their own visual impairment. If you run that test and intentionally miss order the color tiles, and then will activate the option to allow you to adjust a slider which can further give you A white screen that seems to be somewhere in between the really blue display and the really warm AMOLED basic
Sent from my SM-N9005 using Tapatalk

Old thread i know but i just wanted to thank you for that tip Canadoc. I've been struggling with the excessively warm image from my Tab S for a year now and while putting it into "Cinema" mode fixes the white balance it also destroys the contrast by making all subtle dark detail just disappear. This accessibility method has given me much nicer whites without affecting the contrast other than removing the orange haze. I assume the colours are going to be slightly different now but i can't say i've noticed anything there. I wish the Tab S had the same display options as the Galaxy S5 has where you can choose the cooler white level without hammering the contrast too. Maybe it's something Samsung do in order to protect the lifespan of the blue sub-pixel?
So thanks again

When the tab s 8.4 came out the screen quality was a bit variable, but it's been months since I have have read of anybody having a problem, see if you cab get a replacement.
John

Tinderbox (UK) said:
When the tab s 8.4 came out the screen quality was a bit variable, but it's been months since I have have read of anybody having a problem, see if you cab get a replacement.
John
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Mine's the 10.5 and this is the second one i got which was exactly the same as the first one in screen tone.

I always wondered if third-world country`s got B-C grade stock, as the consumer protection can be poor or non-existent, maybe it`s cheaper for the re-seller to buy this lower grade stock with screen color problems ect, I dont know?
John.

Tinderbox (UK) said:
I always wondered if third-world country`s got B-C grade stock, as the consumer protection can be poor or non-existent, maybe it`s cheaper for the re-seller to buy this lower grade stock with screen color problems ect, I dont know?
John.
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UK here and bought from John Lewis. I've heard plenty of issues with screen temp on these ones so it's fairly common. Just using it this morning and thinking it perhaps wasn't quite as white as i'd like it and checked the settings to see if it was still in the proper mode and it was, switched it back to the old one and don't know how i ever lived with that brown tone!

Under different light sources it can take a few minutes for your eyes to adapt to the screen, so white can look a little off while this is happening, as the human eye will normally auto white balance anything you look at.
Does you screen when browsing with a white background at night, but not totally dark still not look perfectly white after a few minutes of looking at the screen.
Everybody seems to see colors slightly differently, and some not so slight, did you see the white/gold blue/black dress debate.
http://www.independent.co.uk/news/s...er-you-see-says-a-lot-about-you-10074490.html
John.
Shriker said:
UK here and bought from John Lewis. I've heard plenty of issues with screen temp on these ones so it's fairly common. Just using it this morning and thinking it perhaps wasn't quite as white as i'd like it and checked the settings to see if it was still in the proper mode and it was, switched it back to the old one and don't know how i ever lived with that brown tone!
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Tinderbox (UK) said:
Under different light sources it can take a few minutes for your eyes to adapt to the screen, so white can look a little off while this is happening, as the human eye will normally auto white balance anything you look at.
Does you screen when browsing with a white background at night, but not totally dark still not look perfectly white after a few minutes of looking at the screen.
John.
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Click to collapse
No it never looks like clean white to me unless i tilted it slightly back or forward and then i could see the tone shift to a cooler temp. I do keep the brightness down to under 10% most of the time and that doesn't help the white level either.
I can't say i ever understood the dress image, you can factually measure and define the colour on that one so i don't know why people were confused.

Have you had anybody else check your screen, do they see the same problem, though at 10% brightness the screen is never going to look really white, I always keep mine on Auto -5 , I have the RGB sensor set on Auto i cannot even remember what it`s really called as i have never changed it, but in Auto it is supposed to keep the whites looking white, what is yours set too.
John.
Shriker said:
No it never looks like clean white to me unless i tilted it slightly back or forward and then i could see the tone shift to a cooler temp. I do keep the brightness down to under 10% most of the time and that doesn't help the white level either.
I can't say i ever understood the dress image, you can factually measure and define the colour on that one so i don't know why people were confused.
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Warm colours
My tab s 8,4 screen has a brownish layer, which makes whites mor brown and the colours less sharp. But when I put pressure on my tab, the "layer" goes away.

Tinderbox (UK) said:
Have you had anybody else check your screen, do they see the same problem, though at 10% brightness the screen is never going to look really white, I always keep mine on Auto -5 , I have the RGB sensor set on Auto i cannot even remember what it`s really called as i have never changed it, but in Auto it is supposed to keep the whites looking white, what is yours set too.
John.
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Sorry for not getting back to you earlier, car knocked the phone pole down and been without for 12 long days. *sigh*
Anyway, i haven't had anyone else look at mine but i don't need anyone to anyway, it's a very overly warm tone. I've never used the RGB adaptive sensor thingy as it only works in a few apps that i never use anyway.
---------- Post added at 01:48 AM ---------- Previous post was at 01:46 AM ----------
ozkarorv said:
My tab s 8,4 screen has a brownish layer, which makes whites mor brown and the colours less sharp. But when I put pressure on my tab, the "layer" goes away.
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Do you see a much whiter tone when you choose Cinema mode? If so and you like it then you really should try the method in this thread to keep it without also cranking up the contrast.

Nexus 5X Screen/Dull Colors

Hello everyone. I am planing to upgrade to a new phone, probably the N5X, but the problem is I can not test one myself. I have watched several reviews and on each one of them I noticed that the screen has dull colors, even when compared to the sony z3. Colors look washed out, with a yellowish tint. This is the only thing keeping me away from buying this phone. Is it as bad as it seems ? Did any of you notice this the moment you started using your N5X ? Any feedback is appreciated. :highfive:

I haven't really found the colors dull. The contrast and saturation is not good as the AMOLED on my Samsung but it wasn't annoyingly so.
It is a warmer display but the Mar or Apr update added a setting to use cooler calibration, which makes it comparable to other "cool" displays. I actually don't turn on that setting because it makes the display too white (for my liking) but it is mostly a matter of what your eyes get used to. Many people find the cooler setting to be preferable.

sfhub said:
but the Mar or Apr update added a setting to use cooler calibration, which makes it comparable to other "cool" displays.
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Where can I find that setting?
Sent from my Nexus 5X using XDA-Developers mobile app

Sn0w0nS said:
Where can I find that setting?
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Settings->Developer Options->Cool Color Temperature

sfhub said:
Settings->Developer Options->Cool Color Temperature
Click to expand...
Click to collapse
Thanks!
Sent from my Nexus 5X using XDA-Developers mobile app

Actually, barring any weird manufacturing issues, the N5X has one of the most accurately calibrated displays right out of the box. The colors might seem dull when compared to an AMOLED or the Triluminous display on your Z3, but they're accurate, not oversaturated. People tend to like saturated and vivid color. ****, I like the saturated color on my Sony 4K TV (uses a similar "Triluminous" color gamut that your current phone uses). I calibrated it one day and hated the color and lack of overall "pop".
Luckily, if you do pull the trigger on an N5X, you can tweak the color settings on your screen to your heart's content using a custom kernel (which you should absolutely have considering it's a Nexus phone) and kernel manager app.

Alcolawl said:
Actually, barring any weird manufacturing issues, the N5X has one of the most accurately calibrated displays right out of the box. The colors might seem dull when compared to an AMOLED or the Triluminous display on your Z3, but they're accurate, not oversaturated. People tend to like saturated and vivid color. ****, I like the saturated color on my Sony 4K TV (uses a similar "Triluminous" color gamut that your current phone uses). I calibrated it one day and hated the color and lack of overall "pop".
Luckily, if you do pull the trigger on an N5X, you can tweak the color settings on your screen to your heart's content using a custom kernel (which you should absolutely have considering it's a Nexus phone) and kernel manager app.
Click to expand...
Click to collapse
I've used color calibration for my m8 before, but when I went ahead and tried to calibrate the n5x display to my liking, I kept coming back close to the default settings.
Haven't used amoled phones in a while but I'm happy with the screen so far, left all calibrations to default.