https://bugs.kde.org/show_bug.cgi?id=426874
Bug ID: 426874
Summary: Subtract alpha pattern mode changed its behaviour
Product: krita
Version: 4.4.0-beta1
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Keywords: regression
Severity: normal
Priority: NOR
Component: Brush engines
Assignee: krita-bugs-n...@kde.org
Reporter: wojt...@gmail.com
Target Milestone: ---
Created attachment 131871
--> https://bugs.kde.org/attachment.cgi?id=131871&action=edit
Examples of not fully cut out pixels
SUMMARY
In the new behaviour of the subtract alpha, it is much more likely for pixels
not to get fully subtracted. Especially visible with strong cut-off pattern
enabled
STEPS TO REPRODUCE
1. Create a new brush without any other dynamics than "pattern"
2. Pick any texture, and in its options, set texturing mode to "subtract
(alpha)", cutoff policy to "cut off pattern", and place the left arrow much
closer to the right one
OBSERVED RESULT
in 4.3 the pattern gets cut, resulting only in some painted dots (where pattern
had extreme value)
in 4.4 all the remaining pixels gets painted, but with the flow dependent on
the pattern. It still saturates to the maximum value very easily
EXPECTED RESULT
Subtracting with pattern with extreme values, results in many fully subtracted
pixels, not just a bit lower opacity ones.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Kubuntu 20.04
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
ADDITIONAL INFORMATION
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