Thank you so much for responding SebaKL! So u actually tested MY pics? Cool. Ive also done some color testing and as u said, they all seem consistent. Some over saturation, but that's expected with amoled.
So what exactly is gradient? Should it concern me? Will it get worse?
As i said, it only appears on certain black screens.
Im glad u did see it tho
Nothing to worry about. Gradient is just a design style, two colors of different tone, blending into each other in liner or circular manner. Example; from dark gray to black.
The Chrome browser background, unlike other apps, doesn't use solid color. It uses very dark gray, transition into almost black. So it appears lighter at the bottom. From the design perspective, it adds a little depth, so it doesn't looks so flat.
It's easy to demonstrate that, just keep rotating the phone and you will see how the lighter part keep re-positioning itself as you rotate the device. If it was screen problem, it should always maintain the bleed in the exact manner.
If your screen had actual problem, you should be able to see the inconsistency, being brighter at the bottom and darker toward the top when you tested the 3 colors using *#0*#.
Amoled it's very energy efficient. If there is a black color, the pixels are turned off. For any lighter color, it will illuminate just that pixel. But, this has one downside. If the screen is solid black with white text, it produce ghost color while scrolling. As it forced the next neighboring pixels to turn on rapidly and display the fine outline of text. To see that, you can open notification bar, and try to swipe away any notification. Just swipe it quickly back and forth (not entirely off the screen). You should see smear and perhaps purple color ghost following the text. To combat that, all the app designer needs to do, is set the screen to 99% black. So every pixel is turn on, just with very low intensity, but that's sufficient prevent visible ghosting from happening.
Some developers, will use color gradient backgrounds, some just very dark gray, that looks almost black. Chrome just happened to go with gradient
I might not explain that too well, my English comprehension sucks, so if there is something you don't understand, let me know, I will try to rephrase it.
cheers and have a good day
p.s. Did you notice that problem you mention above, in any other app?
