https://bugs.kde.org/show_bug.cgi?id=420811
Bug ID: 420811
Summary: Aliasing problem with Perspective tool + nearest
neighbor filter
Product: krita
Version: 4.2.9
Platform: Mint (Debian based)
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Tools/Transform
Assignee: krita-bugs-n...@kde.org
Reporter: elodrei...@free.fr
Target Milestone: ---
Created attachment 128034
--> https://bugs.kde.org/attachment.cgi?id=128034&action=edit
Left : image before transformation (hard edges) - Right : image after
transformation (anti aliasing effect)
SUMMARY
Transforming an image with "Transform tool-> Perspective-> Filter: Nearest
Neighbor should not produce an anti aliasing effect, but it is.
STEPS TO REPRODUCE
1. Load an image with hard edges
2. Select the Transform tool
3. Choose "Perspective" in the tool options
4. Choose "Filter: Nearest Neighbor
5. Clic the image
6. Move one of the four small squares at the corners of the image to distort it
7. Press enter
8. Zoom on the image.
OBSERVED RESULT
Despite the filter "nearest neighbor", an anti aliasing effect has been added.
EXPECTED RESULT
No anti aliasing effect (hard edges)
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux Mint 19.3
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
I have attached an image as an example:
- Left : image before transformation (hard edges)
- Right : image after transformation (anti aliasing effect)
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