| Summary: | Transform tool allows sub-pixel translation | ||
|---|---|---|---|
| Product: | [Applications] krita | Reporter: | Ralek Kolemios <info> |
| Component: | Tools/Transform | Assignee: | Dmitry Kazakov <dimula73> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | halla |
| Priority: | NOR | Keywords: | regression |
| Version: | nightly build (please specify the git hash!) | ||
| Target Milestone: | --- | ||
| Platform: | Microsoft Windows | ||
| OS: | Microsoft Windows | ||
| Latest Commit: | https://invent.kde.org/graphics/krita/commit/7e89dbf7c77198a04040c35fe6febcdcc59bbf8d | Version Fixed In: | |
| Attachments: | Loss in quality over multiple translations | ||
Git commit f1e5a9bc8051d0d5fdbc5cd61779aba60b0c8554 by Dmitry Kazakov. Committed on 26/11/2021 at 07:50. Pushed by dkazakov into branch 'master'. Disable subpixel translation in the transform tool This subpixel translation should be used only when the transformation is **not** a translation. For translation people expect translation to be a lossless transformation. M +14 -5 libs/image/kis_transform_worker.cc https://invent.kde.org/graphics/krita/commit/f1e5a9bc8051d0d5fdbc5cd61779aba60b0c8554 Git commit 7e89dbf7c77198a04040c35fe6febcdcc59bbf8d by Dmitry Kazakov. Committed on 26/11/2021 at 07:51. Pushed by dkazakov into branch 'krita/5.0'. Disable subpixel translation in the transform tool This subpixel translation should be used only when the transformation is **not** a translation. For translation people expect translation to be a lossless transformation. (cherry picked from commit f1e5a9bc8051d0d5fdbc5cd61779aba60b0c8554) M +14 -5 libs/image/kis_transform_worker.cc https://invent.kde.org/graphics/krita/commit/7e89dbf7c77198a04040c35fe6febcdcc59bbf8d |
Created attachment 143704 [details] Loss in quality over multiple translations In 5.1.0, both in modern builds (git 4807d9c) and in builds prior to the addition of the 'Preview' transform tool option (git 9ae7dce), translation of a layer with the transform tool introduces sub-pixel translation of layers. When the transformation has been finished and the layer resampled, this introduces a loss in layer quality which can compound over time. (See attached) This is less noticeable on the 'nearest neighbor' resampling method, though has been shown to in rare cases affect this as well, primarily on the edge of the layer. This bug does not occur on the latest main 4.4.8 release