pnmremap

Replace the colors in a PNM image. More information: https://netpbm.sourceforge.net/doc/pnmremap.html.

• 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}}