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gendit - perform general image dithering
gendit inimage.rgb outimage.rgb
nr ng nb [-s]
gendit uses an ordered dither to create an image
with fewer colors. The argument nr selects how many levels or red to use,
while ng, and nb select the number of green and blue levels respectively.
The minimum value for nr, ng, or nb is 2. The total number of colors used
will be nr*ng*nb. The [lq]-s[rq] option is used to offset the dither patterns
used for red, green and blue by 2 pixels.
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