This article is really nice. I used it as my starting point when I once won a code golf competition on image quality in dithering. Using Fortran. The algorithm

This article is really nice. I used it as my starting point when I once won a code golf competition on image quality in dithering. Using Fortran. The algorithm is based on Sierra Lite, but I added a random element to the direction in which the error is propagated. This removes essentially all dithering artifacts. http://codegolf.stackexchange.com/questions/26554/dither-a-grayscale-image http://codegolf.stackexchange.com/questions/26554/dither-a-g...