https://bugs.kde.org/show_bug.cgi?id=476571
Bug ID: 476571
Summary: Creating Filter Layer based off current selection then
changing its Blending mode will produce artifacts and
weird behavior
Classification: Applications
Product: krita
Version: 5.2.1
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Filter Layers
Assignee: krita-bugs-n...@kde.org
Reporter: dorijan.sa...@gmail.com
Target Milestone: ---
Created attachment 162874
--> https://bugs.kde.org/attachment.cgi?id=162874&action=edit
Results - Initial Filter Layer effect vs Changing blending mode vs Workaround
SUMMARY
Not certain if this is a bug or a limited functionality of how Filter Layer's
transparency (alpha) works in Krita but the results are weird and could be
caused by a bug.
If Filter Layer is added while having an active selection (in order to affect
only selected area) then changing its Blending Mode (for example from default
Copy to Overlay) creates box artifact around affected area and further if
turning visibility of affected layers (layers below the added filter layer) the
effect spreads to entire affected layers.
STEPS TO REPRODUCE
1. Create Paint Layer and draw something (rectangle for example) with any color
except pure white or black (as the result may not be visible based on used
blend mode)
2. Create a selection selecting a portion of added pixels on paint layer
(portion of the rectangle)
3. Add Filter Layer (Gradient Map, HSV adjustment or literally any filter)
4. Change Filter Layer Blending Mode from default Copy to Overlay or something
(some may have a visible issue based on colors used)
OBSERVED RESULT
After Changing the Blending Mode of created Filter Layer, the alpha(?) of that
Filter Layer (not entire added filter effect) will spread around initially
affected selection in a box shape and further turning visibility of affected
Layer/layers below will spread the effect to entire affected layer (the
rectangle from example).
EXPECTED RESULT
After Changing the Blending Mode of created Filter Layer, only Blending Mode
within initially affected Selection should change.
SOFTWARE/OS VERSIONS
Windows: Windows 10 Pro, Version 2009
KDE Plasma Version: nowhere to be found within Krita Help > About KDE
KDE Frameworks Version: same as above
Qt Version: 5.15.7
ADDITIONAL INFORMATION
Currently Installed Krita version 5.2.1 but the issue seems to go further back
(tried 5.0 up to 5.2.1 and had same results). Used RGB/Alpha 8-bit Color Space,
but results are the same in other Models/Depths too.
WORKAROUND
Only way I could find where alpha of Filter Layer doesn't partially bleed past
selection is to Add Transparency Mask based on said selection to the Filter
Layer after changing blending mode. This produces close to desired result where
changing blending mode will stick to selection (currently transparency mask).
However if the transparency mask is added before changing from copy to another
Blend will again reproduce only partial bleed where in order to get full change
I have to turn visibility of affected layer off/on, same if I go back to copy
from any other blending mode.
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