snippetbashTip

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

Submitted by: @import:tldr-pages·Mar 2, 2026·

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thecommandcolorscliimagepnmremapreplacepnm

Problem

How to use the pnmremap command: Replace the colors in a PNM image. More information: <https://netpbm.sourceforge.net/doc/pnmremap.html>.

Solution

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 {{[-ma|-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 {{[-ma|-mapfile]}} {{path/to/palette_file.ppm}} {{[-fs|-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 {{[-ma|-mapfile]}} {{path/to/palette_file.ppm}} {{[-fi|-firstisdefault]}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Use the specified color for representing colors missing in the color palette:

pnmremap {{[-ma|-mapfile]}} {{path/to/palette_file.ppm}} {{[-m|-missingcolor]}} {{color}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Code Snippets

Replace the colors in an image with those in the specified color palette

pnmremap {{[-ma|-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 {{[-ma|-mapfile]}} {{path/to/palette_file.ppm}} {{[-fs|-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 {{[-ma|-mapfile]}} {{path/to/palette_file.ppm}} {{[-fi|-firstisdefault]}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Use the specified color for representing colors missing in the color palette

pnmremap {{[-ma|-mapfile]}} {{path/to/palette_file.ppm}} {{[-m|-missingcolor]}} {{color}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Context

tldr-pages: common/pnmremap

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