Let's say I have an image that is basically two colors, red and white. However there are also parts of the image that are a little bit off white. I want to change those parts to be white, so that the image only has two colors. What program can do that from the command line?
hmm, that didn't work as expected
meh, there is an intensity mapping that forces white into grey thus
worked. Note: a prior version of this answer used
bicolor.gif in.png out.png