https://bugs.kde.org/show_bug.cgi?id=448860
Bug ID: 448860
Summary: Very low max opacity strokes will never reach full
opacity on the canvas
Product: krita
Version: 5.0.2
Platform: Appimage
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: tomtomtomreportin...@gmail.com
Target Milestone: ---
It's possible that I'm just misunderstanding opacity and that this is
intentional behavior, but I'm reporting this just in case it's an actual bug.
SUMMARY
If a user has a very low max opacity on their eraser brush, such as 10%, it
will never fully erase drawings from the layer. Conversely, if the user draws
with very low max opacity, the drawing will never reach 100% opacity. This
occurs regardless if the painting mode is wash or build up.
STEPS TO REPRODUCE
1. Create an 8-bit document with two layers, background layer is white.
2. Draw something.
3. Select an eraser brush like Eraser Soft.
4. Set max opacity to 10%.
5. Attempt to fully erase the drawing.
OBSERVED RESULT
There is still a faint rendering of the drawing.
EXPECTED RESULT
The drawing should be fully erased eventually.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian sid
KDE Plasma Version: 5.23.5
KDE Frameworks Version: 5.88.0
Qt Version: 5.12.12 (appimage)
ADDITIONAL INFORMATION
This issue seems similar to https://bugs.kde.org/show_bug.cgi?id=424075,
however my report concerns opacity instead of flow. It does not appear to be a
regression of Krita 5.
When you select the faint rendering with the color selector's color picker, it
appears as some value like (250, 250, 250), assuming you were drawing in black.
However, if you hide the white background layer and color pick it again, it
appears as (0, 0, 0), despite the fact that the rendering is still just barely
visible.
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