I came across this tool in my masto timeline: cleanEdge
It creates really clean rotations for sprites. It works really well for everything with clean line but struggle with everything with dithering.
Still, I thought that it might be interesting for people around here.
The source code is also available: cleanEdge, a pixel art upscaling algorithm for clean rotations · GitHub
Wow, pretty decent results! And a free web tool to boot.
I'd rather manually clean up a few stray pixels than draw rotations from scratch!
(Nice upscaling ability too.)
Wow, it is really awesome! I was so impressed that I made a Java port of it. Thank you for sharing.
My port does not produce 100% identical images with the web version (I may have missed some subtleties) but it is pretty close.