Bill Atkinson's formula.
Burkes dithering.
Floyd-Steinberg dithering.
Jarvis, Judice, and Ninke filter.
Don't spread the error to neighbor pixels.
Frankie Sierra's dithering algorithm (sometimes called Sierra-3).
Sierra Lite dithering.
Stucki dithering.
Simplified two-row Sierra algorithm.
Specifies the method of two-dimensional error diffusion dithering.