Bug 475609

Summary:	Mitchell scale up image cause artifact on image
Product:	[Applications] krita	Reporter:	zy <firecloud888>
Component:	Resize/Scale Image/Layer	Assignee:	Krita Bugs <krita-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	raghu
Priority:	NOR
Version First Reported In:	5.2.0
Target Milestone:	---
Platform:	Other
OS:	Other
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	OBSERVED RESULT(with tiling artifact) Expect mitchell scale

Description zy 2023-10-14 14:27:31 UTC

Created attachment 162294 [details]
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

Comment 1 zy 2023-10-14 14:28:09 UTC

Created attachment 162296 [details]
Expect mitchell scale