https://bugs.kde.org/show_bug.cgi?id=493273
Bug ID: 493273
Summary: Gwenview renders 'zopflipng' reencoded RGB PNGs
incorrectly
Classification: Applications
Product: gwenview
Version: 24.08.1
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: gooda...@starmail.net
Target Milestone: ---
Created attachment 173773
--> https://bugs.kde.org/attachment.cgi?id=173773&action=edit
Test RGB with artifacts
SUMMARY
Gwenview struggles with RGB PNGs reencoded by `zopflipng`, though other
applications listed below don't have that problem. Black-White PNGs reencoded
by `zopflipng` are not affected.
In my case I created theese images in GIMP, but also achieved the same result
with reencoding image created in Krita.
Works under X11 and Wayland.
STEPS TO REPRODUCE
1. Compress RGB PNG image through `zopflipng file.png`
2. Open it in Gwenview
3. Zoom it (Ctrl++, Ctrl+-, Ctrl+MouseWheel etc.)
OBSERVED RESULT
Random dots are shown, but ther are not included into picture directly.
Firefox, Eye of GNOME (eog), Viewnior, gThumb and others are showing this image
correctly, without theese dots, even if you'll zoom closely.
EXPECTED RESULT
I want it work as expected.
SOFTWARE/OS VERSIONS
Zopfli 1.0.3 (zopflipng is in this package)
Operating System: EndeavourOS
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.9-arch1-2 (64-bit)
Graphics Platform: X11
ADDITIONAL INFORMATION
Vanilla Gwenview, vanilla KDE Plasma, vanilla EndeavourOS.
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