ppmchange
Change all pixels of one color in a PPM image to another color. tldr-pages
On several platforms
Several platforms
Exchange the first color in each oldcolor - newcolor pair with the second color
ppmchange oldcolor1 newcolor1 oldcolor2 newcolor2 ... path/to/input.ppm >path/to/output.ppmIdentifySpecify how similar colors must be in order to be considered the same
ppmchange -closeness percentage oldcolor1 newcolor1 oldcolor2 newcolor2 ... path/to/input.ppm >path/to/output.ppmIdentifyReplace all pixels not specified in the arguments by a color
ppmchange -remainder color oldcolor1 newcolor1 oldcolor2 newcolor2 ... path/to/input.ppm >path/to/output.ppmIdentify