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pnmsmooth — Smooth out a PNM image. More information: <https://netpbm.sourceforge.net/doc/pnmsmooth.html>.

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

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commandclismoothimagepnmsmoothoutmorepnm

Problem

How to use the pnmsmooth command: Smooth out a PNM image. More information: <https://netpbm.sourceforge.net/doc/pnmsmooth.html>.

Solution

pnmsmooth — Smooth out a PNM image. More information: <https://netpbm.sourceforge.net/doc/pnmsmooth.html>.

Smooth out a PNM image using a convolution matrix of size 3x3:

pnmsmooth {{path/to/input.pnm}} > {{path/to/output.pnm}}

Smooth out a PNM image using a convolution matrix of size width times height:

pnmsmooth {{[-w|-width]}} {{width}} {{[-h|-height]}} {{height}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Code Snippets

Smooth out a PNM image using a convolution matrix of size 3x3

pnmsmooth {{path/to/input.pnm}} > {{path/to/output.pnm}}

Smooth out a PNM image using a convolution matrix of size width times height

pnmsmooth {{[-w|-width]}} {{width}} {{[-h|-height]}} {{height}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Context

tldr-pages: common/pnmsmooth

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