[krita] [Bug 427153] New: Some self made .png patterns not read correctly in subtract alpha mode

[Wojciech Trybus]

https://bugs.kde.org/show_bug.cgi?id=427153

            Bug ID: 427153
           Summary: Some self made .png patterns not read correctly in
                    subtract alpha mode
           Product: krita
           Version: 4.4.0-beta2
          Platform: Other
                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 132023
  --> https://bugs.kde.org/attachment.cgi?id=132023&action=edit
bundle with one of the presets that stopped working. I would add the image too,
but I guess I can have only one attachment?

SUMMARY
I found out that presets from my brushpack are still not working the same way
they did in 4.3 (even after fixing the cut-off bug). Subtract pattern behaviour
changed, though the difference seems to be only on one of the .png patterns I
made myself, and not on the default ones. I tried really hard to tell exactly
which part of the pattern settings works differently, but couldn't find a
direct answer.

STEPS TO REPRODUCE
1. import the bundle I attached (contains one preset with a brushtip and
pattern)
2. compare the result on krita 4.3 and 4.4b2

OBSERVED RESULT
The pattern is barely visible in 4.4. It isn't subtracting most of the pixels.
The preview on brush editor seems fine.

EXPECTED RESULT
No change in the same mode from 4.3 to 4.4

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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