| Summary: | Aliasing problem with Perspective tool + nearest neighbor filter | ||
|---|---|---|---|
| Product: | [Applications] krita | Reporter: | Xavier Dole <elodreivax> |
| Component: | Tools/Transform | Assignee: | Dmitry Kazakov <dimula73> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | dimula73, halla |
| Priority: | NOR | ||
| Version: | 4.2.9 | ||
| Target Milestone: | --- | ||
| Platform: | Mint (Debian based) | ||
| OS: | Linux | ||
| Latest Commit: | https://invent.kde.org/graphics/krita/commit/ac4eb8ceadae7a926c835e8afc45b40de482218f | Version Fixed In: | |
| Sentry Crash Report: | |||
| Attachments: | Left : image before transformation (hard edges) - Right : image after transformation (anti aliasing effect) | ||
I will take this bug :) Git commit e0b44f443baa6b9baf1b85432e587865da05819e by Dmitry Kazakov. Committed on 25/05/2021 at 10:49. Pushed by dkazakov into branch 'master'. Fix Nearest Neighbour filter of the perspective transform mode Perspective transform mode should use nearest neighbour when user requests it. M +50 -4 libs/image/kis_perspectivetransform_worker.cpp M +9 -1 libs/image/kis_perspectivetransform_worker.h M +7 -2 plugins/tools/tool_transform2/kis_transform_utils.cpp https://invent.kde.org/graphics/krita/commit/e0b44f443baa6b9baf1b85432e587865da05819e Git commit ac4eb8ceadae7a926c835e8afc45b40de482218f by Dmitry Kazakov. Committed on 01/06/2021 at 12:09. Pushed by dkazakov into branch 'krita/4.3'. Fix Nearest Neighbour filter of the perspective transform mode Perspective transform mode should use nearest neighbour when user requests it. M +50 -4 libs/image/kis_perspectivetransform_worker.cpp M +9 -1 libs/image/kis_perspectivetransform_worker.h M +7 -2 plugins/tools/tool_transform2/kis_transform_utils.cpp https://invent.kde.org/graphics/krita/commit/ac4eb8ceadae7a926c835e8afc45b40de482218f |
Created attachment 128034 [details] 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)