Thanks for the link, that was a nice writeup indeed! It's a different technique though, using a dither pattern gives a very different look from error diffusion

Thanks for the link, that was a nice writeup indeed! It's a different technique though, using a dither pattern gives a very different look from error diffusion (which IMO looks more natural). But in the example you posted, the pattern is a nice stylistic effect. I might actually have to try and code up what I outlined above to see if it works.