snippetbashTip

pnmquantall — Run `pnmquant` on multiple files at once such that they share a common colormap. See also: `pnmquant

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

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commandrunfilesmultipleclipnmquantallpnmquantonce

Problem

How to use the pnmquantall command: Run pnmquant on multiple files at once such that they share a common colormap. See also: pnmquant. More information: <https://netpbm.sourceforge.net/doc/pnmquantall.html>.

Solution

pnmquantall — Run pnmquant on multiple files at once such that they share a common colormap. See also: pnmquant. More information: <https://netpbm.sourceforge.net/doc/pnmquantall.html>.

Run pnmquant on multiple files with the specified parameters, overwriting the original files:

pnmquantall {{n_colors}} {{path/to/input1.pnm path/to/input2.pnm ...}}

Save the quantised images to files named the same as the input files, but with the specified extension appended:

pnmquantall {{[-e|-ext]}} {{extension}} {{n_colors}} {{path/to/input1.pnm path/to/input2.pnm ...}}

Code Snippets

Run `pnmquant` on multiple files with the specified parameters, overwriting the original files

pnmquantall {{n_colors}} {{path/to/input1.pnm path/to/input2.pnm ...}}

Save the quantised images to files named the same as the input files, but with the specified extension appended

pnmquantall {{[-e|-ext]}} {{extension}} {{n_colors}} {{path/to/input1.pnm path/to/input2.pnm ...}}

Context

tldr-pages: common/pnmquantall

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