Bug#879717: Options to fix visible gradients in wallpapers ?

[Aurélien COUDERC <zecoucou@free.fr>]

control: tag -1 moreinfo

Dear Axel & Frank,

thank you for the bug report !

Actually the Debian provided themes are all SVG files and so as far as I know the gradients used in the wallpapers are pure gradients without any steps or irregularities.

So the problem here seems to be that your desktop environment (I understand LXQt ?) renders the SVGs in a suboptimal way.

I can see a few options to fix this :
- Fix LXQt to make better use of the SVGs when rendering them as wallpapers. It would need to use dithering in the rendering because even in 24/32 bit color depth rendering without dithering makes the gradients steps visible.
- Distribute the wallpapers as bitmaps in desktop-base (again). I say again because I spent some time in the Stretch cycle to ship the SVGs to make the package smaller. We have wallpaper, lock screen, login background and others, often provided in different resolutions and aspect ratio so shipping everything as bitmaps tend to make the package huge.
- There's actually a problem in the SVGs themselves that I don't know of. Please explain what's going on so I can get a grasp on the issue.

You can guess my preference is for the first option but I'm open to discussion. :-)
I don't know how easy it would be to fix in the LXQt wallpaper renderer, or even in the SVG if that is possible.


Cheers,
--Aurélien