A greyscale dithering tool in haskell
Usage: dither [OPTION..] file
-h --help View this help dialogue
-i[FILE] --input[=FILE] Input file
-o FILE --output=FILE Output prefix
-c FLOAT --cutoff=FLOAT Indicates brightness cutoff
-r --rainbow use random colors in place of white
-t["6 DOUBLES"] --twocolor[="6 DOUBLES"] RGB for dark and light sections