SUMMARY Using a selecting tool with vector selection turned mode (on the elliptical selection, polygonal selection or freehand selection tools) causes a thin line of pixels around the boundary of the selection to be deleted. STEPS TO REPRODUCE 1. Fill any image with a non-white color (https://imgur.com/oKw0SQ5) 2. Select a region of the image using (e.g.) freehand select tool (https://imgur.com/xRIk0aF) 3. Using the move tool (T), move the selection one pixel to the left and then one pixel to the right (https://imgur.com/M5TfgtJ) OBSERVED RESULT The image has a thin white contour around it, showing which pixels were deleted (https://imgur.com/dktlf2B) EXPECTED RESULT No pixels around the boundary should be removed SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
That's the antialiasing of the selection. If I move the selection back into its exact original location, there is no contour.
(In reply to Halla Rempt from comment #1) > That's the antialiasing of the selection. If I move the selection back into > its exact original location, there is no contour. That hasn't been my experience. The steps I described should leave the image exactly as started, but there's still a white border around the region afterwards.
Perhaps this could be considered a duplicate of https://bugs.kde.org/show_bug.cgi?id=442191 , however this concerns the Move tool and not the Transform tool. The behavior that Breno describes does seem a bit buggy. For example, creating a vector selection in a sea of black and then simplying clicking the selection with the Move tool will product artifacts on the edges.