Bug 453873 - RGBA brushes creates artifacts
Summary: RGBA brushes creates artifacts
Status: RESOLVED WORKSFORME
Alias: None
Product: krita
Classification: Applications
Component: Brush engines (other bugs)
Version First Reported In: 5.0.5
Platform: Microsoft Windows Microsoft Windows
: NOR normal
Target Milestone: ---
Assignee: Krita Bugs
URL:
Keywords: triaged
Depends on:
Blocks:
 
Reported: 2022-05-16 08:13 UTC by radian
Modified: 2025-06-01 11:51 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
some brush strokes with the effect (96.84 KB, image/jpeg)
2022-05-16 08:13 UTC, radian 		Details
brush preset (154.19 KB, image/png)
2022-05-16 08:13 UTC, radian 		Details
brush tip (351.60 KB, image/x-gimp-gbr)
2022-05-16 08:14 UTC, radian 		Details
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Description radian 2022-05-16 08:13:04 UTC 
Created attachment 148872 [details]
some brush strokes with the effect

SUMMARY
Some presets with RGBA brushes (mostly bristle ones) creates black and white artifacts around the edges (see example). Even with zero contrast


STEPS TO REPRODUCE
1. install example preset and tip
2. try to draw with it

SOFTWARE/OS VERSIONS
Windows: 10
Comment 1 radian 2022-05-16 08:13:50 UTC 
Created attachment 148873 [details]
brush preset
Comment 2 radian 2022-05-16 08:14:13 UTC 
Created attachment 148874 [details]
brush tip
Comment 3 wolthera 2023-01-26 14:14:48 UTC 
Hey,

I cannot reproduce with the Krita Version: 5.2.0-prealpha (git 5c98a72) Appimage with Qt 5.15.7

Is this still relevant?
Comment 4 radian 2023-01-27 07:29:37 UTC 
Checked on latest nightly build for windows, same brush, still relevant(
Also I noticed that there is no artifacts if brush size > 150px
Comment 5 Bug Janitor Service 2023-01-28 05:09:18 UTC 
Thanks for your comment!

Automatically switching the status of this bug to REPORTED so that the KDE team
knows that the bug is ready to get confirmed.

In the future you may also do this yourself when providing needed information.
Comment 6 Halla Rempt 2025-05-30 11:16:33 UTC 
I also cannot reproduce this with the provided preset and brush tip.
Comment 7 radian 2025-05-31 21:24:18 UTC 
With this particular brush tip I can reproduce it on my win pc, can reproduce it in wsl krita build, can reproduce it on windows tablet. Most noticeable on neutral background and neutral brush color and (surprisingly) 16bit color.
Not going to say it's more than some very minor specific thing. Maybe I'll try to poke it myself.
Comment 8 Halla Rempt 2025-06-01 11:51:39 UTC 
Ah, with 16 bit/channel -- I missed that. I think we've actually got other reports for artefacts with rgba brushes with 16 bit channel. I think, though, that these brushes were designed only for 8 bit/channel images.