This web utility seems like exactly what you’re describing. I think this was a small app someone made for themselves while developing a game for Playdate. The source might be available on their Github. If not they seem friendly, you could ask for it.
yes I’m looking for C algorithms for that. I just searched for “1bit old-school image”
This web utility seems like exactly what you’re describing. I think this was a small app someone made for themselves while developing a game for Playdate. The source might be available on their Github. If not they seem friendly, you could ask for it.
Search for Floyd Steinberg dithering. That’s the algorithm used by a lot of classic Mac software.