https://bugs.kde.org/show_bug.cgi?id=483536
Bug ID: 483536
Summary: [Regression] Removal of "Non 8-bit" PNGs Support in
Dolphin.
Classification: Applications
Product: dolphin
Version: 24.02.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: dolphin-bugs-n...@kde.org
Reporter: kdelo...@mozej.com
CC: kfm-de...@kde.org
Target Milestone: ---
SUMMARY
***
PNGs thumbnails can be displayed only for 8-bit PNGs.
Checking my other PNGs that, I created via '$ gm identify exapmle.png" revealed
that Dolphin (Plasma 6) cannot display thumbnlails, unless its 8-bit. 12-bit or
16-bit PNGs thumbnails are NOT displayed. Its a regression, because, it used to
work in Plasma 5.
***
STEPS TO REPRODUCE
0. Check if Dolphing has "no size limit" for thumbnails (its default, but make
sure, so you don't ask this question).
1. Install graphics magic to identify PNGs via $ gm identify
2. Use gimp to create PNGs (8-bit, 12-bi, 16-bit)
3. Open Dolphin to see that only 8-bit PNGs have thumbnails (unlike
Plasma/KDE6)
OBSERVED RESULT
Lack of 12-bit or 16-bit PNG thumbnails
EXPECTED RESULT
Make it work as in KDE 5.xxx to display all thumbnails for PNG regardless of
bit depth (8-bit sucks and is difficult to compress [wbp, avif, jxl,...] and
results in artifacts...).
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Graphics Platform: X11
Graphics Processor: Intel Only
ADDITIONAL INFORMATION
various $ pacman -Qs:
kdesdk-thumbnailers 24.02.0
kdegraphics-thumbnailers 24.02.0
ffmpegthumbs 24.02.0
qt6-imageformats 6.6.2
kimageformats 6.0.0
libpng 1.6.43
libavif 1.0.4 (stil no thumbnails in Dolphin)
libheif 1.17.6
libwebp 1.3.2
webp-pixbuf-loader 0.2.7
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