I made a pixel art upscaling/rotation algorithm called cleanEdge! It makes rotating pixel art as clean as possible torcado.com/cleanEdge I made a tool for it too! drop your sprites in and get some nice rotated or upscaled versions :)
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it's hard to create an animated comparison. here's a comparison of two still frames at arbitrary angles. they're similar, cleanEdge tends to preserve outlines better (direct link without compression: torcado.com/cleanEdge/demo/cleanEdge-comparison.mp4)
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