Color halftoning and other testings

Look much better than Pang's method and it is fast.



Intensity=128

not good in visualiztion

Intensity tests:

Intensity black pixels percentage

25 27060/30000 90.2%

80 20591/30000 68.64%

100 18248/30000 60.82%

128 14946/30000 49.82%

204 6010/30000 20.03%