@neauoire @levibeach here's a bunch I did in Kotlin a while back: https://codeberg.org/oppen/DitherKt/src/branch/master/src/online/fisk/filters/Filter.kt

@oppen @levibeach ahh! excellent thanks :) I will port this to C.

@neauoire you're welcome to adapt my atkinson dither C implementation any way you'd like: https://pbat.ch/wiki/dither/

@paul OOooh look at that the function is already there, lemme try it out :)

@neauoire if you find any problems with it let me know. The code is based on the info I found on this page: https://tannerhelland.com/2012/12/28/dithering-eleven-algorithms-source-code.html

@paul footer on the wiki is great btw, thanks.

@neauoire it's growing on me as well. thanks for the suggestion :)

@neauoire @levibeach Biskwit, NeuQuant and Wu's Quantizers are also worth a look. While they focus on colour the techniques work on greys too. I use NeuQuant and Wu for converting between 24-bit and fixed palette spaces on Amiga:

https://bisqwit.iki.fi/story/howto/dither/jy/

https://scientificgems.wordpress.com/stuff/neuquant-fast-high-quality-image-quantization/

Also Graphics Gems II is a hell of a book for this sort of thing: http://index-of.co.uk/Game-Development/Programming/Graphics%20Gems%202.pdf