pnmremap
Remap image colors to a specified palette
TLDR
Remap image to palette
$ pnmremap -mapfile=[palette.pnm] [input.pnm] > [output.pnm]
Use Floyd-Steinberg dithering$ pnmremap -floyd -mapfile=[palette.pnm] [input.pnm] > [output.pnm]
No dithering$ pnmremap -nofloyd -mapfile=[palette.pnm] [input.pnm] > [output.pnm]
SYNOPSIS
pnmremap [options] [file]
DESCRIPTION
pnmremap replaces each pixel's color in a PNM image with the closest matching color from a specified palette image. This is useful for forcing an image to use only a specific set of colors, such as when targeting a limited-color display format.The -floyd option enables Floyd-Steinberg error diffusion dithering for smoother visual results. The palette is provided via -mapfile as a PNM image where each unique pixel color represents one allowed color. Part of the Netpbm toolkit.
PARAMETERS
FILE
Input PNM file.-mapfile FILE
Color palette image.-floyd
Use Floyd-Steinberg dithering.-nofloyd
No dithering.-norandom
Disable random dithering.-firstisdefault
Use first palette color as default.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm
CAVEATS
Requires palette file. Part of Netpbm suite.
HISTORY
pnmremap was created as part of Netpbm for color palette mapping.
SEE ALSO
ppmquant(1), pnmcolormap(1), ppmtogif(1)
