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# create a 2 color image from scratch to supply colors for mapping
$ convert -size 10x10 xc:white -fill red -draw 'rectangle 0 0 5 5' \
    -colors 2 +dither bicolor.gif
# map 'em, Danno!
$ convert -colors 2 -normalize +dither -remap bicolor.gif in.png out.png

The first command doesn't work.

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Is there an error message? – RedGrittyBrick Oct 15 '10 at 19:21

I figured it out. Instead of using single quotes double quotes need to be used, then it works.

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That sounds... wrong... – Ignacio Vazquez-Abrams Nov 21 '10 at 17:51

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