Krita's Transform tool causes severe transparent artifacts that actually rendered into the result. It only happens when the canvas behind the transformed layer has nothing to cover its transparent areas. Steps to reproduce: 1) Open a JPG (which has only 1 layer) 2) Transform tool 3) Move or rotate the layer 4) Huge blocks of pixels goes in and out of transparency. 5) Hit Apply 6) The artifacts are rendered into the result. * The transform tool is also very choppy now, which is a recent development. Workaround: 1) Insert a layer below the transformed layer 2) Fill it with white 3) Transform 4) Now it doesn't generate artifacts, but still very choppy. Tested with krita-5.0.0-beta1-92c6cb6-x86_64.appimage
The transform tool now renders inside the layer stack, and that is slower. This cannot be made faster, sorry. You can re-enable the old behaviour in the settings. I cannot reproduce any artefacts when testing with a jpeg image of one layer.
Created attachment 141420 [details] Krita 5.0 Transform tool artifacts After a little test, I've found that the issue is, again, LittleCMS optimization related. When these options are on: 1) Use system monitor profile (I have one) 2) Allow Little CMS optimizations It will cause all kinds of artifacts in almost every HUD elements on canvas. I think we should take look into this optimization a bit more...
BTW, after setting Allow LittleCMS Optimizations, you must restart Krita to see the difference in case of the artifacts.
Okay, the good news is that we're getting patches into lcms to fix those issues. Cc'ing amyspark so this bug can be in the list of closable bugs once those fixes land in the deps build.
Thanks! That's good to know.
The bug has been fixed with the latest LCMS patches.