Bug 449850

Summary: Blur filter on filter layer renders with artifact
Product: [Applications] krita Reporter: yetanotherpainter <bohdankornienko>
Component: Filter LayersAssignee: Krita Bugs <krita-bugs-null>
Status: CONFIRMED ---    
Severity: normal CC: halla, leodev2, rmoerlandrj
Priority: NOR Keywords: triaged
Version First Reported In: nightly build (please specify the git hash!)   
Target Milestone: ---   
Platform: Microsoft Windows   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: System information from Krita
Screenshot of gaussian blur on a paint layer in a group layer
Krita file with artifacts

Description yetanotherpainter 2022-02-09 12:43:23 UTC
Created attachment 146489 [details]
System information from Krita

SUMMARY
***
While using filter layer with Gaussian Blur the resulting image looks like it was cut off.
***


STEPS TO REPRODUCE
1. Create a new Paint layer
2. Draw a filled shape (circle in my case)
3. Put this layer into a group
4. Add new Filter Layer on top of the Paint Layer
5. Use Gaussian Blur filter with maximum blur value

OBSERVED RESULT
The blurred shape looks as if it was cut by square

EXPECTED RESULT
Entire shape blurred without cut edges.

SOFTWARE/OS VERSIONS
Attached in file

ADDITIONAL INFORMATION
The behaviour is observed on portable version
Comment 1 Halla Rempt 2022-02-14 14:14:26 UTC
Created attachment 146711 [details]
Screenshot of gaussian blur on a paint layer in a group layer

Could you please check this screenshot, whether I have tried correctly to reproduce your issue? I doesn't show anything weird for me...
Comment 2 Halla Rempt 2022-02-14 14:14:46 UTC
Oh, and maybe also attach the kra file that shows this issue?
Comment 3 yetanotherpainter 2022-02-16 18:51:23 UTC
Created attachment 146833 [details]
Krita file with artifacts

If you take a closer look at your blurred circle you will notice small cuts on the top and left.
Comment 4 Halla Rempt 2022-02-16 19:31:35 UTC
You're right! Thanks for checking!
Comment 5 Robert Moerland 2024-09-01 10:16:42 UTC
I can reproduce the issue running krita-x64-5.3.0-prealpha-703c3eae on Windows 10, with the steps as described in the original report. The attched example file also still shows the buggy behavior in this version. To emphasize, the step of adding the filter layer to the group seems to be essential for reproduction. Moving it out of the group results in the desired behavior.
Comment 6 MAINIE Zhuma 2025-07-18 12:08:41 UTC
*** Bug 489548 has been marked as a duplicate of this bug. ***