https://bugs.kde.org/show_bug.cgi?id=445672
Bug ID: 445672
Summary: Color banding on openGL canvas view when output
format is set to Rec.2020(10 bit)
Product: krita
Version: 4.4.8
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: OpenGL Canvas
Assignee: krita-bugs-n...@kde.org
Reporter: 2376112...@qq.com
Target Milestone: ---
SUMMARY
Color gradient at canvas becomes color banding and stair-stepping-like when
output format is set to Rec. 2020 PQ (10 bit) and Canvas Graphic Acceleration
is enabled.
When the color gradient is export to png file and viewed at other software, it
retains smooth which it is supposed to be. Turning off Canvas Graphic
Acceleration when Rec. 2020 PQ (10 bit) is on would make color gradient smooth,
but it is slow and raises some rendering flaws.
STEPS TO REPRODUCE
1. At Display-HDR settings-Preferred Output Format, chose Rec. 2020 PQ (10
bit).
2. Reboot Krita.
3. Create a new file. (color depth and icc profile keep default)
4. Paint some color gradient on canvas.
OBSERVED RESULT
Color banding and stair-stepping
EXPECTED RESULT
Color gradient should be smooth.
SOFTWARE/OS VERSIONS
Windows 10
ADDITIONAL INFORMATION
GPU: It can be reproduced on my nvidia 1650, 3050 laptop and amd integated GPU
on 5800U, with latest driver.
Screen: It can be reproduced on my HDR400 capable screen and normal 8bit laptop
screen.
I have tried changing file color depth and icc profile, but banding still
reproduced.
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