Hi @youssef.eskandar, @DavidRutten, @Dancergraham, @laurent_delrieu and everybody else interested,
Today, I had some time to attempt my own Floyd-Steinberg dithering algorithm in GHPython.
It opens an image from a provided path, performs the dithering and outputs points and colors for visualisation purposes. It’s by no means perfect, but it works! 
And this one is for you, @youssef.eskandar! 
Everybody, please feel free to test it yourself!
floyd_steinberg_dithering_v1.gh (10.9 KB)