Quantization to 256 colors with none/Riemersma error dithering

256 Colors	256 Colors + Riemersma
Uniform (3,3,2)
RMSE 29.379	RMSE 40.804
Popularity (5 bits)
RMSE 8.167	RMSE 11.534
Median Cut (8 bits)
RMSE 5.874	RMSE 8.976
Octree (8 bits 2-pass)
RMSE 5.539	RMSE 8.043
Xiaolin Wu v2
RMSE 4.601	RMSE 6.788
Dennis Lee v3 (5 bits)
RMSE 4.500	RMSE 6.734
Binary Split
RMSE 4.579	RMSE 6.764
Lloyd (K-Means)
RMSE 4.378	RMSE 6.605
NeuQuant (200 cycles)
RMSE 4.458	RMSE 6.623
SColorQ
NA