https://bugs.kde.org/show_bug.cgi?id=455106
Bug ID: 455106
Summary: Value (HSV) blend mode changes saturation unexpectedly
Product: krita
Version: 5.0.6
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: Color models
Assignee: krita-bugs-n...@kde.org
Reporter: rainco...@gmail.com
Target Milestone: ---
SUMMARY
"Value" blend mode (under HSV section) should only change value.
STEPS TO REPRODUCE
1. Create a layer and fill it with hsv(0, 100, 50) (a dark red color)
2. Create another layer above it, fill it with hsv(0, 0, 100) (pure white)
3. Change the top layer's blend mode to "Value"
OBSERVED RESULT
The blended color is hsv(0, 49.8, 100) (pink)
EXPECTED RESULT
The blended color is hsv(0, 100, 100) (pure red)
SOFTWARE/OS VERSIONS
Krita 5.0.6
probably all platforms
ADDITIONAL INFORMATION
I know other software has similar behavior. However, I still consider it a bug.
Krita's "Value" blend mode is explicitly under "HSV" section, which implies it
should change the value and value only, according to HSV color model. It
shouldn't change saturation somehow. If I'd like to change lightness, I'd use
"Lightness" blend mode (under HSL section). "Value" shouldn't try to be smart
like this.
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