https://bugs.kde.org/show_bug.cgi?id=425318
Bug ID: 425318
Summary: Strange artifacting when using Copy paint layers and
also when using Copy brushes of certain engines
Product: krita
Version: 4.3.0
Platform: Appimage
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: tomtomtomreportin...@gmail.com
Target Milestone: ---
SUMMARY
Reposting from
https://krita-artists.org/t/how-is-the-copy-blending-mode-practically-different-from-normal/10799
, artifacts start appearing on the canvas in some cases when using Copy paint
layers and/or when using a brush preset set to Copy. This does not seem to
happen with Filter layers. When Copy is applied to the brush preset, it does
not seem to happen when using the Color Smudge, Hatching, Deform, or Filter
brush engines.
To reproduce using layers:
1. Have a white background layer and an empty layer 1
2. Set layer 1 to Copy
3. Draw, observe transparency artifacting
4. Move layer 1 around a bit, observe more artifacting
5. Set layer 1 back to Normal
Observed result: Lots of artifacting leftover, can be wiped away by changing
opacity of background layer
To reproduce using a brush preset:
1. Have a white background layer and an empty layer 1
2, Set a Pixel engine brush to Copy
3. Draw two different circles overlapping each other, observe (intentional?)
blocking of white around stroke area
4. Change opacity of background layer
Observed result: The blocking in step 3 gets thickened for some reason
EXPECTED RESULT
I'm not totally sure how Copy works so I'm not totally sure what to expect, but
at the very least it shouldn't leave leftover artifacts when switching a Copy
layer back to Normal,
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian sid
(available in About System)
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.12.8 (Appimage)
ADDITIONAL INFORMATION
This happens regardless if it's the CPU canvas or the OpenGL canvas. The
artifacting might become more apparent when spamming undo after these steps.
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