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