Volna won the wallpaper competition, so time to add it to Breeze as the new default!
Apply patch, compile, and restart plasmashell
Outstanding concern: The full collection is much larger than Ice Cold; 46 Mb compared to 13 Mb for all the Ice Cold versions. The author already did some optimization, but everything is still quite a bit larger in total.
What's with the odd dithering, though? Is that intentional?
FTR at 3840x2160 our past images were:
5.16 (ice cold) 1.6 MiB
5.14 (the one with the galaxy) 3.9 MiB
5.12 (the blue-brown stripe) 3.2 MiB
5.10 2.3 MiB
5.9 (canoppee with the "9") a whopping 5.9 MiB
So this one doesn't seem too excessive? Compared to ice cold, maybe, but not compared to the ones before it imho.
The compression affected the wallpaper quality quite a lot, especially at lower resolutions. There are some artifacts (unnaturally bright pixels)
If saving space is very important, JPEG format may be the best option. The loss of quality for this kind of image (lots of noise) is minimal.
@IlyaBizyaev suggested using the MozJPEG encoder at https://squoosh.app/ and the results are fantastic. I can detect no difference in appearance whatsoever from normal viewing distances (i.e. not zoomed in to 500%) and the total size is now down to 8 Mb. I used a 90% quality level to try to keep the visual fidelity as much as possible.