pnmremap
Replace the colors in a PNM image.
TLDR
Replace the colors in an image with those in the specified color palette
$ pnmremap -mapfile [path/to/palette_file.ppm] [path/to/input.pnm] > [path/to/output.pnm]
Use Floyd-Steinberg dithering for representing colors missing in the color palette
$ pnmremap -mapfile [path/to/palette_file.ppm] -floyd [path/to/input.pnm] > [path/to/output.pnm]
Use the first color in the palette for representing colors missing in the color palette
$ pnmremap -mapfile [path/to/palette_file.ppm] -firstisdefault [path/to/input.pnm] > [path/to/output.pnm]
Use the specified color for representing colors missing in the color palette
$ pnmremap -mapfile [path/to/palette_file.ppm] -missingcolor [color] [path/to/input.pnm] > [path/to/output.pnm]
