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Quantization to 256 colors of Lena with None/Riemersma error dithering.


The image is scaled down to 400x400

original

256 Colors256 Colors + Riemersma
Uniform (3,3,2)
uniform
RMSE 26.980
uniform+rie
RMSE 39.141
Popularity (5 bits)
popular
RMSE 11.106
popular+rie
RMSE 18.728
Median Cut (8 bits)
median
RMSE 5.953
median+rie
RMSE 8.600
Octree (8 bits 2-pass)
octree
RMSE 6.448
octree+rie
RMSE 9.083
Xiaolin Wu v2
wu
RMSE 5.395
wu+rie
RMSE 7.747
Dennis Lee v3 (5 bits)
dl3
RMSE 5.316
dl3+rie
RMSE 7.766
Binary Split
bs
RMSE 5.365
bs+rie
RMSE 7.754
Lloyd (K-Means)
kmeans
RMSE 5.177
kmeans+rie
RMSE 7.682
NeuQuant (200 cycles)
nq
RMSE 5.227
nq+rie
RMSE 7.515
SColorQ
NA