https://bugs.kde.org/show_bug.cgi?id=450205
Bug ID: 450205
Summary: Gamma not applied correctly to PNG
Product: gwenview
Version: 21.08.1
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: ancoron.lucife...@gmail.com
Target Milestone: ---
Created attachment 146704
--> https://bugs.kde.org/attachment.cgi?id=146704&action=edit
Original gradient with default gamma
SUMMARY
Gamma applied incorrectly.
STEPS TO REPRODUCE
1. Create a gradient (sets gamma by default to 1/2.2): `convert -size 1280x720
-define gradient:vector=32,32,1248,688 gradient:#ff0000-#00ffff gradient.png`
2. Open image `gradient.png` in gwenview
OBSERVED RESULT
Colors are way too bright.
EXPECTED RESULT
Colors are correct.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
When inverting the gamma value the image is displayed correctly, but metadata
is actually wrong and other programs will make the image look wrong: `convert
gradient.png -set gamma 2.2 gradient-inverted-gamma.png`
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