https://bugs.kde.org/show_bug.cgi?id=496597
Bug ID: 496597
Summary: Zooming into PNG images with indexed colors leads to
dithering artifacts
Classification: Applications
Product: gwenview
Version: 23.04.2
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: a...@laxu.de
Target Milestone: ---
Created attachment 176054
--> https://bugs.kde.org/attachment.cgi?id=176054&action=edit
200% Zoom
SUMMARY
When zooming into a PNG image with indexed color mode, dithering artifacts are
visible that are not there when displaying it at 100% zoom. Both zooming in and
out leads to dithering patterns even on areas with a single color.
STEPS TO REPRODUCE
1. Export an image as PNG with indexed colors
2. Open it in gwenview
3. Use another zoom than 100%.
OBSERVED RESULT
Artifacts that are not in the original image at 100%
EXPECTED RESULT
The image should be rescaled in RGB mode instead of using the original color
palette.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.15
Graphics Platform: X11
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