https://bugs.kde.org/show_bug.cgi?id=484335
Bug ID: 484335
Summary: Very Poor Quality of Backgrounds
Classification: Plasma
Product: Plasma Workspace Wallpapers
Version: 6.0.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: bugreport...@mailna.me
Target Milestone: ---
Created attachment 167659
--> https://bugs.kde.org/attachment.cgi?id=167659&action=edit
Annotated Screenshots Explaing Poor Quality of Backgrounds
SUMMARY
***
"Next" Backgrounds of KDE 6 are very poor quality.
***
STEPS TO REPRODUCE
1. Copy the content of "/usr/share/wallpapers/Next/contents/" to your
"/home/user/Pictures";
2. Take a closer look at the 5120x2880 PNG (downsacled PNGs have even worse
quality).
OBSERVED RESULT
1. Ugly banding around the tree and sky around the sun (see annotated
screenshot);
2. Complete lack of aliasing (see screenshot);
3. Leftovers from JPG compression reveal that PNG was made from a JPG (see
screenshot);
4. Info about 5120x2880 file reveals its just only 8-bit depth;
5. Due to linear downscaling, lower resolution PNGs have worse quality.
EXPECTED RESULT
1. Provide high quality original 5120x2880 PNG;
2. Provide genuine 16-bit depth of the original PNG;
3. Provide genuine PNG, that isn't converted from JPG;
4. For lower resolutions, downscale the new 5120x2880 HQ-16-bit PNG, using
lanczos function with four lobes.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Graphics Platform: X11
Graphics Processor: Intel HD
ADDITIONAL INFORMATION
$ sudo pacman -Syyu && sudo pacman -S imagemagick inkscape gimp --noconfirm
a) use graphics vectoring to draw round objects without aliasing;
b) do not use jpg, its a lossy compression, leaving ugly artifacts;
c) when exporting graphic vectors to PNG in GiMP, use wavelet antialiasing,
before final exporting to PNG.
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