https://bugs.kde.org/show_bug.cgi?id=443635
Bug ID: 443635
Summary: In LAB color mode, 32bit float, The gamma value 2.2
was incorrectly applied. It should work in linear
gamma 1.0
Product: krita
Version: 5.0.0-beta2
Platform: Other
OS: Other
Status: REPORTED
Severity: major
Priority: NOR
Component: Color models
Assignee: krita-bugs-n...@kde.org
Reporter: iekudr...@outlook.jp
Target Milestone: ---
Created attachment 142363
--> https://bugs.kde.org/attachment.cgi?id=142363&action=edit
OBSERVED RESULT EXPECTED
SUMMARY
In LAB color mode, 32bit float, The gamma value 2.2 was incorrectly applied. It
should work in linear gamma 1.0
http://www.ericbrasseur.org/gamma.html
Read this. This caused a bug.
STEPS TO REPRODUCE
1. Go to LAB color mode.
2. Adjust the picture to 50% size. or, You can also apply a radius of 2 pixels
Gauss Blur.
3. Exported to PNG.
OBSERVED RESULT
Look attachment.
EXPECTED RESULT
Look attachment.
SOFTWARE/OS VERSIONS
Windows: 11
macOS: 11Big Sur
Linux/KDE Plasma: Ubuntu latest LTS
KDE Frameworks Version: 5.0-beta2
Qt Version: 5.0-beta2
ADDITIONAL INFORMATION
GIMP does not have this BUG, Fixed in 2.10.
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