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.
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)