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For dithered images I find waifu2x with the noise removal at 'None' to be pretty good at scaling these things up without destroying the dithered shapes.

Unrelated (Maybe related actually) this tool for applying old-school style dithering to an image with a bunch of settings and dithering algos: https://doodad.dev/dither-me-this/



I actually tried waifu2x from mobile, and it looks good! Not sure if it will work as a desktop background, but thanks for the tip!




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