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Album Art does NOT display properly

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AMJF:
I am using the current build of Rockbox on a Sansa Clip Zip with a colour screen, and I've noticed an issue with some album art not showing up correctly.

Most album art shows up fine, even though the resolution is tiny (less than 50x50 pixels!) but I have two albums (a Mozart compilation and a movie soundtrack) that have black areas in most of the picture and a lighter area in the middle, and for some reason they show up on Rockbox as very light grey, and it spoils the look of the image. Why is it showing up grey when it is black everywhere else?

ZincAlloy:
It's the display's fault. The difference between black and the darkest shade of grey is exaggerated.

The orginal firmware has the same problem, but it makes album art look even worse because it doesn't dither 24bit graphics down as nicely as rockbox.

AMJF:
The Sandisk Sansa Zip has an OLED display, meaning that it emits light, so on Rockbox when there are black areas on the screen, they are BLACK, ie. no light emitted whatsoever on those pixels.

I don't agree with you either, as other album art with black areas or bits show up totally black in those parts. I think I may be able to show you with photos if I compare the album art on the Sansa with, say, Foobar2000 on my PC with the same album art at the same time. I would take the photos with my Android smartphone which, BTW, displays the album art flawlessly on the standard music player.

saratoga:

--- Quote from: AMJF on May 14, 2014, 10:19:44 AM ---The Sandisk Sansa Zip has an OLED display, meaning that it emits light, so on Rockbox when there are black areas on the screen, they are BLACK, ie. no light emitted whatsoever on those pixels.

--- End quote ---

I don't see how thats related to the color accuracy. 

FWIW, I don't think album art looks that bad on my device.  I remember multiple models of display are used, perhaps some are better than others, or maybe one of them has buggy color scaling?

ZincAlloy:
The black is perfect. Not-quite black ist just much too bright. And the color is off, too. A little greenish I think.
Cabbiev2's gradient shows off the problem nicely.

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