https://bugs.kde.org/show_bug.cgi?id=496350
Bug ID: 496350
Summary: JXL images losslessly transcoded from jpg fail to load
Classification: Frameworks and Libraries
Product: frameworks-kimageformats
Version: 6.7.0
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: alex.me...@kde.org
Reporter: livingnightm...@thelivingnightmare.xyz
CC: aa...@kde.org, kdelibs-b...@kde.org
Target Milestone: ---
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SUMMARY
JXL images that have been losslessly transcoded from a jpg do not load,
regardless of what QT6 based app is used.
STEPS TO REPRODUCE
1. Transcode a jpg into a jxl file losslessly
2. Open the file in any QT6 image viewer
OBSERVED RESULT
The image fails to load
EXPECTED RESULT
The image loads
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 41 Kinoite
KDE Plasma Version: 6.2.3
KDE Frameworks Version: 6.8.0
Qt Version: 6.8
ADDITIONAL INFORMATION
I tested this with YACReader (Flatpak) and Gwenview (Fedora RPMs and Flatpak).
To make sure this wasn't a bug with the jxl library, I tested the images that
failed to load in Eye Of Gnome (Fedora RPMs), and the images did load.
I've also noticed that jxls losslessly converted from PNGs occasionally render
as spirals in YACReader.
Running Gwenview (Flatpak) from command line opening a transcoded jpg gives the
error: "Unexpected event 16384 instead of JXL_DEC_COLOR_ENCODING"
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