07-04-2021, 09:02 AM
(07-04-2021, 08:16 AM)PixLab Wrote: Wow!!!
Congrat, You've discovered a bug!
The rotating tool become insanely huge after 7 to 8 confirmed rotation (confirmed = when you click OK), never saw that (because I never rotate more than just few times)
As a matter of fact the grid, increase proportionally after each confirmed rotation
the rotating grig after 10 or 11 rotations from minus 12 000 pixels to plus 15 000 pixels
Tests made with a Layer + its Mask
A quick work around (I did tried it and it works):
Time to time after few confirmed rotations, just go to Menu > Layer > Layer to image size, and the rotating tool will reset its size, thus freeing memory or process and GIMP get back to its normal speed
BUT you will loose everything outside the canvas
I don't think it's a bug: when you rotate an image by 45%, the rectangle image that contains everything from the previous image has a side which is √2 larger than the initial image. So this image contains √2*√2=2 times more pixels that the initial image. So you double the number of pixels for each rotation, and after 8 rotations you have an image which is 256 times bigger in area (16x bigger on the side). Of course for smaller rotations the increase is smaller, but things are worse for a non-square image(*).
You also have an image that has become seriously blurry, because cumulating rotations is bad idea, which is perhaps why nobody really cares about this problem...
(*) Start with 100*1px image: it contains 100px. rotate it by 45°, it becomes a 72*73px image, containing 5256 pixels, so 50x bigger...