https://bugs.kde.org/show_bug.cgi?id=471871
Bug ID: 471871
Summary: Image gets white outline on certain transparent parts
in some image viewing programs and other software
Classification: Applications
Product: krita
Version: 5.1.4
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: major
Priority: NOR
Component: File formats
Assignee: krita-bugs-n...@kde.org
Reporter: redmat...@gmail.com
Target Milestone: ---
Created attachment 160045
--> https://bugs.kde.org/attachment.cgi?id=160045&action=edit
Example file. The white border will show up in some programs, f.ex. Discord
around the platform only. Windows does _not_ show it.
SUMMARY
Image looks fine in Krita, but when exported as png there is a subtle white
outline around icons and models I export.
I would expect it to fade to whatever color was in the area, not to... white.
This seems to always happen when using the outline effect, but randomly with
other areas too. Probably the png has white color in the almost fully alpha
region for some reason?
The white line makes the textures unsuitable for use in some programs.
STEPS TO REPRODUCE
1. Start new scene.
2. Clear scene so it become transparent
3: Draw something in part of the image.
4. Add a stroke with 100% transparency.
5. Export as PNG with default settings.
OBSERVED RESULT
Image looks okay in some programs, but others such as Discord, Rimworld, etc.
produce a white outline around the border.
This makes the exported image unsuitable for importing into f.ex. Rimworld, and
possibly other Unity programs since Rimworld is Unity-powered.
Importing the image into GIMP and resaving it fixes the image.
EXPECTED RESULT
No white outline regardless of image program used to open it; png behaving as
when reexported from GIMP.
SOFTWARE/OS VERSIONS
Windows: 10
Krita 5.1.4
ADDITIONAL INFORMATION
Additional info in this Krita thread on the official discord:
https://discord.com/channels/435123295550046218/1124341944055775373/1124341944055775373
Some OS:es doesn't seem to see the white outline. The thread shows an image of
how it renders on windows 10 using a 4090. That image is not attached since
there seems to be a max of two files on these reports.
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