Develop Bugs

Gradient Banding on my G2 - need help!

A while back I opened my phone to fix a few other things which was actually successful (power button, touch digitizer, in ear speaker volume).
But when I reassembled my phone, I powered it on and I noticed that the colors were dull on my lcd, with noticable banding in gradients that were black grey white. This occurs in everything that appears on my screen including videos; even pictures that I take on the phones camera after they are tranferred onto my mac - still have banding!
So I thought that it must be something to do with the phones lcd screen? And its not able to transition from gradient to gradient in objects, which is causing the banding.
Anyone ever heard of this being a problem? Any solutions? Even ideas that can help me figure out how this whole thing works.
Appreciate it.
The first two pics, you can see how they have a blue tone to them, and that's the same thing I see on my homescreen/videos.
The second pic is a normal gradient. If this were to be viewed on my phone, in the white/lighter areas of the gradient there would be pink/blue banding. Only the black to white gradient shows the banding, but other colors are still quite vivid such as reds, oranges, yellows, even green. But I do know that it has something to do with light and shading with respect to lcd coloring.
By the way, screenshots of my home screen or any other screen using ShootMe are normal without banding.
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bump...ahhhhhh

Guess taking it apart didn't work as well as you thought
Sent from my T-Mobile G2 using XDA Premium App

I get banding in wallpapers with gradients on my G2, regardless of color. Although it's much easier to see on black/white/gray type gradients. I figure it's just a limitation of the LCD to accurately reproduce said gradients because if I view the same images on my PC monitor the banding isn't present.

dhilberg said:
I get banding in wallpapers with gradients on my G2, regardless of color. Although it's much easier to see on black/white/gray type gradients. I figure it's just a limitation of the LCD to accurately reproduce said gradients because if I view the same images on my PC monitor the banding isn't present.
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Hmm yeah, I get it in everything. Themes, videos, pictures, etc. It seems like there is a color limitation, its annoying.

TheToiletSpaula said:
Hmm yeah, I get it in everything. Themes, videos, pictures, etc. It seems like there is a color limitation, its annoying.
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Did a bunch of Googling, came up with this:
http://www.reddit.com/r/Android/com...rs/?utm_source=twitterfeed&utm_medium=twitter
Long story short, use the Wallpaper Set and Save app from the Market to apply your wallpapers. For some reason it fixes the banding. Tried it myself, it works. Doesn't solve the problems with your video, etc. though.
So obviously the LCD is perfectly capable of displaying images without the gradient banding. My guess is when the gallery is used to set wallpapers the images go through some sort of compression process.
EDIT: Looks like the gallery (Gallery 3D in my case) is the cause of the problem. I tried QuickPic too but it displays banding as well.
EDIT 2: Actually I was mistaken. QuickPic doesn't display banding.
What seems to happen is that when you select an image to set as a wallpaper with Gallery 3D, it saves a copy of it and sets that copy as the actual wallpaper. The copy is compressed, which is what causes the banding. Both QuickPic and Wallpaper Set and Save do not create a copy of the wallpaper, hence why there's no banding. Looks like it's bye bye Gallery 3D.
Thanks for bringing this up, something that's bothered me for a while but never bothered to deal with it.

Yeah im going to continue to try and figure this out. If the Wallpaper Set and Save app can fix the wallpapers that means there must be some sort of calibration that can be done to draw out normal colors from your lcd.
The thing is...the black and white gradients that are affected are part of most images especially videos since gradients are transitioning all the time as the image moves.
There has to be sometihng that can fix this gradient transitioning problem for the black and white shades.
Thats where im at. :S.

Update:
I applied the above black to white gradient pic as my background using Wallpaper Set and Save to use as a test to whether it would get rid of the banding and...
IT DID NOT WORK.
My LCD still displays pink/blue banding along the transition from black to white. It must be some sort of damage that my phone sustained possibly though the 1. LCD screen connections to PCB, 2. The PCB circuits (under the shields), 3. Or the Flex Cable.
****, I need some ideas on how I can fix this...

Indeed, you might have some damage.
I downloaded your black to white gradient image and set it as my wallpaper with both Wallpaper Set and Save and QuickPic. Both times no gradients or color banding was present.
Sent from my G2 using XDA Premium App

Pink stripe down middle of screen

On my E4GT, when I turn the display brightness really low with my ScreenDim app, and then look at something (e.g., a PDF file) which fills the screen with a white background (and black text), while being in a dark room, I can see that the middle third of the screen is slightly pinkish, forming a pinkish vertical stripe, instead of white.
Does anyone else have the issue? If you want to try to see if yours has the issue, you can use ScreenFilter and turn the brightness really low, or you can use the free ScreenDim Trial and set to 25% or a bit lower (in Easy Mode). I'm wondering if I should return the phone to the store, or if they're all like this.

Does the lack of replies mean that I am the only one having the problem?

arpruss said:
Does the lack of replies mean that I am the only one having the problem?
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LOL, good for you for being persistent AR.
I tested this for you on mine and I'd say mine is a little over half on the left side as what you described.
Edit: Title is a little misleading but your initial comment about the whole left side of the screen seems to be correct.

Sounds like a symptom of the application. I have not seen a single et4g with a pink line/screen come through my service and repair centers.

eeeeeeeeek said:
Sounds like a symptom of the application. I have not seen a single et4g with a pink line/screen come through my service and repair centers.
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This is something you wouldn't normally see in a stock scenario. The lighting app allows for drawing the screen down below 25% and the discoloration is very faint. I wouldn't probably have even noticed it unless I was asked specifically to look for it.
I don't think AR was pointing it out as a problem. He was probably just curious if anyone else could duplicate it using the same setup (well, and to make sure he wasn't really having an issue too I suppose ).

ee[LEFT said:
[/LEFT]eeeeeeek;26299088]Sounds like a symptom of the application. I have not seen a single et4g with a pink line/screen come through my service and repair centers.
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Click to collapse
No, I don't think it's a software problem. The app lowers screen brightness to the lowest level allowed by the OS and then draws a light gray overlay over the screen. The device isn't rooted and the app uses standard documented apis. None of this should produce a nonuniform effect like this stripe. In theory, the same issue should come up if one turns the brightness to a minimum with the OS settings and them loads a light gray image. I'll see if I can produce it.
Also, you only see the effect well if you are in a quite dark room. But since I like to read in the dark, this matters to me. If all units have this, I'll live with it. But if it's only mine, I want it to be fixed.
This issue is one of the reasons I haven't rooted: I may need to return the unit.

You are right. I would want to know if it is my phone or not before I make a decision to have it replaced. What if the replacement phone not only has the same issue, but a couple of new ones as well?

Here's a test that doesn't require any special app.
Turn off automatic brightness and set brightness to minimum.
Then view this test image with the browser
http://pruss.mobi/test/A0.jpg
Zoom until it fills the screen. Go into a dark closet or other windowless room without lights. View the screen from different angles. To me, the discoloration is most visible if I view it in portrait mode, straight on. It disappears if I tilt the screen side-to-side a bit. Here is an attached copy:
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Here are some other test images. For me, the above one showed the discoloration best, but it might be different for different people.
http://pruss.mobi/test/70.jpg
http://pruss.mobi/test/80.jpg
http://pruss.mobi/test/90.jpg
http://pruss.mobi/test/B0.jpg
http://pruss.mobi/test/C0.jpg
http://pruss.mobi/test/D0.jpg
http://pruss.mobi/test/E0.jpg
The images are all solid gray.
Here's a QR code for the A0 image:

Hi AR. I tried it out again but I still do not have a line down the screen. I tried several screen brightness levels all the way to 0% where I could barely see the grey and still no line for me. Hope this helps and hopefully someone else will try it for you too.

tdunham said:
Hi AR. I tried it out again but I still do not have a line down the screen. I tried several screen brightness levels all the way to 0% where I could barely see the grey and still no line for me. Hope this helps and hopefully someone else will try it for you too.
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The other issue my screen has is that if I view a 100% black image, and go into a very dark area (when I tested this most thoroughly, I was in a closed, windowless garage at night), and let my eyes get adjusted to the dark, eventually (after a bit of dark adaptation) I see an gray glow from the screen, with many irregular small patches that are completely black peeking out of the grayness. This is a very small aberration, but it is noticeable when outside at night running an astronomy app.

Interestingly, after a couple of months the problem seems to have decreased. Or my brain is screening it out.

How to make screen display black like screen is off?

As we know, SA screen is self lighting not like traditional LCD screen that needs background lighting , so it is possible to make display black as 100% pure black, in the dark doesn't even see the screen is on.... I have seen a picture comparable with IPS, SLCD... etc, which in the dark place you can't even know the screen is on when it displays black...
I just don't know what value set to make it happen, anyone has any idea?
Sent from my Galaxy Nexus using xda premium

If you have a device with display SuperAMOLED ok, but if it is any other display you can not do anything, the screen is hardware component and you can not change it via software
Sent from my Galaxy Nexus using xda premium

polimeno said:
If you have a device with display SuperAMOLED ok, but if it is any other display you can not do anything, the screen is hardware component and you can not change it via software
Sent from my Galaxy Nexus using xda premium
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Click to collapse
I know, what I was talking about is i9250, I just don't know how to make it happen
Sent from my Galaxy Nexus using xda premium

What exactly are you trying to accomplish? Sure you can do it, but I can't imagine why on earth would you want to make the whole screen black. You can't use a black screen, may as well just turn the display off.

pfmiller said:
What exactly are you trying to accomplish? Sure you can do it, but I can't imagine why on earth would you want to make the whole screen black. You can't use a black screen, may as well just turn the display off.
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this is what i am trying to do
if i don't mark that place, i guess you don't even know there is forth phone exist , do you ?
that is AMOLED screen

The pixels in amoled displays individual turn on/off so when you display a black image the pixels are off.
Sent from my Galaxy Nexus using xda premium
---------- Post added at 11:44 PM ---------- Previous post was at 11:43 PM ----------
The pixels in amoled displays individualy turn on/off so when you display a black image the pixels are off.
Sent from my Galaxy Nexus using xda premium

Still not sure why you want to do this, but you can get pretty close by viewing a all black pictures in photo gallery. I think there are also pixel tester apps in the market that can display a full screen of one color.

pfmiller said:
Still not sure why you want to do this, but you can get pretty close by viewing a all black pictures in photo gallery. I think there are also pixel tester apps in the market that can display a full screen of one color.
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The reason most people are trying to figure this out is because it will save an abundant amount of battery life if less led's are being used when the screen is on.

I'm a little confused as to what you're trying to do, but some roms like AOKP you can turn off the nav bar. In which case, just find a totally black picture (or make one in paint) and view it in the gallery

Im using an app called no wallpaper from the play store. As far add I can tell it does just that, gives you a setting to have nothing as a wallpaper, pure black.

nope... i tried to view whole black picture , but still there is some background light like displaying grey when i place my phone in dark place , i can't set it 100% black like screen is off. can't figure out how is RGB and gamma setting
i know it is non-sense , but i am just curious about it...

qtwrk said:
nope... i tried to view whole black picture , but still there is some background light like displaying grey when i place my phone in dark place , i can't set it 100% black like screen is off. can't figure out how is RGB and gamma setting
i know it is non-sense , but i am just curious about it...
Click to expand...
Click to collapse
I do not believe there's anything you can do about it. Even the amoled displays will have a very faint background lightning that can be seen when it gets dark. Amoled displays have very nice blacks but they are not 100% pure black.
I think that photo tricks you. As traditional LCD displays have much more background lightning going on. That photo is obviously exposed so that the little light that comes from the darker one has so little light coming from it so the sensor on the camera couldn't capture it with such a "quick" exposure that was needed to accurately display the background light from the LCD displays.

dannejanne said:
I do not believe there's anything you can do about it. Even the amoled displays will have a very faint background lightning that can be seen when it gets dark. Amoled displays have very nice blacks but they are not 100% pure black.
I think that photo tricks you. As traditional LCD displays have much more background lightning going on. That photo is obviously exposed so that the little light that comes from the darker one has so little light coming from it so the sensor on the camera couldn't capture it with such a "quick" exposure that was needed to accurately display the background light from the LCD displays.
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Very accurate post here. Here's a great video from XDA TV that talks about the differences:
http://www.xda-developers.com/xda-tv-2/truth-about-mobile-device-screens-xda-developer-tv/

There is a thread here about the GNex screen which, in a photo, shows that the leds dont turn off completely when it wants to show black. There still is some amount of light coming out.
Sent from my AOKP Nexus using xda Premium

Yep, just tested it with CNA. Turned off navbar, statbar, dock, used pure black wallpaper. Phone looks like it's turned off under normal lighting. But in a completely dark room there is a dim, gray, 1280x720 rectangle.

Screen and black levels WAY too black?

Compared to my N4, the screen has deeper blacks, but in a very bad way. You lose so much detail on some pictures, even at full brightness. Like with a picture of black fur my N4 will show all the nuances and shadows caused by the fur, but the Sony will just be pitch black. The amount of detail is pretty significant. Overall, the tone of the screen is just darker, and it kind of makes you sad using it.

I have the same opinion, this is the most annoying thing on this phone. I had very strong feeling to return it back to the shop.
Any solution for this? I can increase screen backlight, but it is not ideal solution and it does not solve the problem.

toiletsss said:
Like with a picture of black fur my N4 will show all the nuances and shadows caused by the fur
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Upload the picture please.

Yes, blacks are heavily crushed on this device. Here's an earlier discussion of it with links to calibration testers:
http://forum.xda-developers.com/showthread.php?t=2646749
See Erica Griffin's mini review where she discusses the calibration problems and charts the wonky gamma levels here:
http://www.youtube.com/watch?v=a7tQ5n32no8#t=564
If you don't want to install the Display Tester app, here's a link to a black level test image for viewing in your phone browser:
http://www.lagom.nl/lcd-test/black.php
Ideally all of the black squares should be distinguishable to ensure proper reproduction of detail in shadowed areas of an image or video. With Nexus 5, for instance, squares are distingushable from square 2/3 upward.
For Sony Z1 Compact with JDI panel, squares are distinguishable only from square 7 upward. Result: all black levels below 7 look the same on the Z1C, meaning no detail can be distinguished at these levels. One consequence is that low light photos look very inaccurate compared to how they'll look on other displays - if you share or edit them, for example.

I have exactly the same feeling, im from a nexus 4 too and i try to watch some movies on my Z1C and the contraste is juste horrible.
Any ideas on how to fix this?

when its bright ppl say " zomg its wash out"
when black then complain too black

xerox89 said:
when its bright ppl say " zomg its wash out"
when black then complain too black
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Click to collapse
This has nothing at all to do with the brightness of the black levels. This is about how many black levels can actually be seen with this screen. And yes, this is a legitimate complaint.

ghtop said:
This has nothing at all to do with the brightness of the black levels. This is about how many black levels can actually be seen with this screen. And yes, this is a legitimate complaint.
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This exactly. And thank you for your previous post, it was extremely informative. I was really hoping I just had a faulty screen because I love the phone otherwise. I really love sony's products but the screens on the Z1, Z1s, and Z1c have all been problematic, particularly in dealing with blacks and whites. I really hope these problems are addressed in the Z2 because I really need a replacement for this N4.
Edit: So this affects JDI panels too? From what I read, the JDI panel is much better than the AUO panels.

This is mine, JDI panel...
Using the website...
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ghtop said:
With Nexus 5, for instance, squares are distingushable from square 3 upward.
Click to expand...
Click to collapse
Using the app...

Heh, remember that there's little point taking a screenshot for comparison unless 1) you shoot it with a camera that has accurate black levels 2) you view it on a screen that has accurate black levels. Otherwise we're all just looking at different things.
Useful info to share in this thread would be how many black levels from that test page you can actually see on your screen (i.e. the number of the last square you can distinguish from another).

ghtop said:
Useful info to share in this thread would be how many black levels from that test page you can actually see on your screen (i.e. the number of the last square you can distinguish from another).
Click to expand...
Click to collapse
I can see from square 7 using the app and the website.

XperienceD said:
I can see from square 7 using the app and the website.
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Click to collapse
Edit: Argh, sorry, my mistake, it should have been 7 instead of 13, as stated in the original thread - corrected now. You can only really see those levels at full brightness in a dark room, though. More detail is lost at normal brightness levels where you aren't being blinded by the whites.

Have to agree, black levels are way too dark. You lose loads of detail in any dark scene, video and photos. Also gamma levels are far too low, at about 1.6 across the board. They should be around 2.2. I'm coming from a galaxy s2 which now seems to have more accurate colour reproduction. Which is disappointing considering it's a super amoled screen vs an ips panel.
Sent from my D5503 using XDA Premium 4 mobile app

There is very simple workaroud for this . Install "Screen Adjuster" app from Google Play, open it, set Contrast value to ca "-30", switch "Adjuster OFF" to "ON" and voila, now you can see black levels up to 1 otherwise, I'm able to clearly recognize only values up to 7 on full brightness on 4.4.2 latest FW .757 with JDI panel using Color Test app
Screen Adjuster: https://play.google.com/store/apps/details?id=com.netmanslab.sa
source: http://forum.xperia.cz/viewtopic.php?f=85&t=9946&p=163390

pcpepik said:
There is very simple workaroud for this . Install "Screen Adjuster" app from Google Play, open it, set Contrast value to ca "-30", switch "Adjuster OFF" to "ON" and voila, now you can see black levels up to 1 otherwise, I'm able to clearly recognize only values up to 7 on full brightness on 4.4.2 latest FW .757 with JDI panel using Color Test app
Screen Adjuster: https://play.google.com/store/apps/details?id=com.netmanslab.sa
source: http://forum.xperia.cz/viewtopic.php?f=85&t=9946&p=163390
Click to expand...
Click to collapse
Excellent, excellent post! Thank you so much for this. It definitely works!

pcpepik said:
There is very simple workaroud for this . Install "Screen Adjuster" app from Google Play, open it, set Contrast value to ca "-30", switch "Adjuster OFF" to "ON" and voila, now you can see black levels up to 1 otherwise, I'm able to clearly recognize only values up to 7 on full brightness on 4.4.2 latest FW .757 with JDI panel using Color Test app
Screen Adjuster: https://play.google.com/store/apps/details?id=com.netmanslab.sa
source: http://forum.xperia.cz/viewtopic.php?f=85&t=9946&p=163390
Click to expand...
Click to collapse
Wish I saw this earlier. Might have to buy it again. Can anybody show examples with dark, detailed photos?

toiletsss said:
Wish I saw this earlier. Might have to buy it again. Can anybody show examples with dark, detailed photos?
Click to expand...
Click to collapse
I just wonder why the hell the Screen adjuster needs full network access, view my network connections, reads precise position GPS, needs access to my bookmarks and history, read the device accounts... Why ? I prefer that sony will modify the contrast in next firmware...

fidel73 said:
I just wonder why the hell the Screen adjuster needs full network access, view my network connections, reads precise position GPS, needs access to my bookmarks and history, read the device accounts... Why ? I prefer that sony will modify the contrast in next firmware...
Click to expand...
Click to collapse
And use 20% of my batteries...

Excellent. I can now see it from box 1. Not sure about battery draining though. So disabling the app for now and waiting for an actual fix in the next release. For some reason, I am very happy that it's a bug in the configuration settings and not an actual hardware issue. Sony has again succeeded in screwing their awesome specs with a ****ty software.

fidel73 said:
I just wonder why the hell the Screen adjuster needs full network access, view my network connections, reads precise position GPS, needs access to my bookmarks and history, read the device accounts... Why ? I prefer that sony will modify the contrast in next firmware...
Click to expand...
Click to collapse
It's ad-ridden, but there is a cheap paid version that requires only the essential draw over other apps permission and does not drain battery

Question Camera producing blue images (TV)

Everytime iv took a picture of any TV screen, it's either purple or blue, you can see some slight red colours but what's up with this?
Anyone know or anyone have similar issues?
No filters lol
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"lightbox_share": "Share",
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kevinireland11 said:
Everytime iv took a picture of any TV screen, it's either purple or blue, you can see some slight red colours but what's up with this?
Anyone know or anyone have similar issues?
No filters lol
View attachment 5473311
Click to expand...
Click to collapse
Haven't noticed it on outdoor images but these of my TV the blacks are more bluish.

ggrant3876 said:
Haven't noticed it on outdoor images but these of my TV the blacks are more bluish.
Click to expand...
Click to collapse
Going to clear cache and data and try a reinstall see if that helps

No issue with mine

skimminstones said:
No issue with mine
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Click to collapse
That's really weird it seems to be only my TV in the living room, strange, must be whatever panel the TV is using
Edit: tried uploading a pic of my son's TV but it tells me my file size is to big :/
But this TV is fine

kevinireland11 said:
That's really weird it seems to be only my TV in the living room, strange, must be whatever panel the TV is using
Edit: tried uploading a pic of my son's TV but it tells me my file size is to big :/
But this TV is fine
Click to expand...
Click to collapse
Have you tried rotating the phone (like, portrait, landscape, reverse landscape, etc.)?
The TV might be using a polarising layer that simply conflicts with the camera for some reason. My P6 Pro for example works fine for every screen I've tried shooting so far, EXCEPT the main info display in my building's lobby, which has different colours disappear at different angles. E.g. in portrait it doesn't have any green, in landscape (turning counter clockwise, power and volume buttons on top) it doesn't have any red, etc.

fonix232 said:
Have you tried rotating the phone (like, portrait, landscape, reverse landscape, etc.)?
The TV might be using a polarising layer that simply conflicts with the camera for some reason. My P6 Pro for example works fine for every screen I've tried shooting so far, EXCEPT the main info display in my building's lobby, which has different colours disappear at different angles. E.g. in portrait it doesn't have any green, in landscape (turning counter clockwise, power and volume buttons on top) it doesn't have any red, etc.
Click to expand...
Click to collapse
I tried that there, I did see some colours come through the lens but then back to blue, it's weird because when I don't focus on the TV then point the camera back fast I see full colours but then the colours turn blue, I done this via landscape to, stays colourful for about about 3 seconds then goes all blue, strange, maybe it's a cheap panel with poor LEDs or more blue led pixels than red or green?
Edit: my son's tv is perfect, it's defo a cheaper panel then

I got the same thing when snapping a Pic on my desktop PC. I thought nothing of it at the time, as it wasn't for my personal use.
I'll try it again when the opportunity arises, see if I can repeat the effect.
@kevinireland11
Update on the blue screen effect.
My memory was a little fuzzy on that....
Turns out, I saw that when snapping a Pic of my other phone's IMEI/Serial number hidden menu.
Just tried it out w/both my Google Pixel 6 PRO & Samsung Galaxy Z Flip 3, was able to replicate w/both, but only in that scenario with both in dark there.
Placed both phones in non-dark theme & I could not replicate while snapping pix of the same IMEI/Serial number hidden menus.
Snapping pix of my TV/PC also produced normal pix.