https://bugs.kde.org/show_bug.cgi?id=475609

            Bug ID: 475609
           Summary: Mitchell scale up image cause artifact on image
    Classification: Applications
           Product: krita
           Version: 5.2.0
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Resize/Scale Image/Layer
          Assignee: krita-bugs-n...@kde.org
          Reporter: firecloud...@gmail.com
  Target Milestone: ---

Created attachment 162294
  --> https://bugs.kde.org/attachment.cgi?id=162294&action=edit
OBSERVED RESULT(with tiling artifact)

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug
symbols.
See
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***
Seems like this is a regression bug :
https://bugs.kde.org/show_bug.cgi?id=151408
Check other users on forum test this bug:
https://krita-artists.org/t/seems-krita-has-a-wrong-mitchell-scale-algorithm-implementation/76008

STEPS TO REPRODUCE
1. Add a image into krita layer
2. Scale up image using mitchell

OBSERVED RESULT
Tiling artifact on image

EXPECTED RESULT
Smooth image

SOFTWARE/OS VERSIONS
Windows: Windows 10, Krita 5.2

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