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Specifies the method of two-dimensional error diffusion dithering.
Atkinson: 4;
Bill Atkinson's formula.
Burkes: 5;
Burkes dithering.
FloydSteinberg: 1;
Floyd-Steinberg dithering.
JarvisJudiceNinke: 2;
Jarvis, Judice, and Ninke filter.
NoDithering: 0;
Don't spread the error to neighbor pixels.
Sierra: 6;
Frankie Sierra's dithering algorithm (sometimes called Sierra-3).
SierraLite: 8;
Sierra Lite dithering.
Stucki: 3;
Stucki dithering.
TwoRowSierra: 7;
Simplified two-row Sierra algorithm.