snippetbashTip

pnmhistmap — Draw a histogram of a PNM image. More information: <https://netpbm.sourceforge.net/doc/pnmhistmap.ht

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

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commandclidrawimagehistogrammorepnmpnmhistmap

Problem

How to use the pnmhistmap command: Draw a histogram of a PNM image. More information: <https://netpbm.sourceforge.net/doc/pnmhistmap.html>.

Solution

pnmhistmap — Draw a histogram of a PNM image. More information: <https://netpbm.sourceforge.net/doc/pnmhistmap.html>.

Draw a histogram of a PNM image:

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

Draw the histogram as dots instead of bars:

pnmhistmap {{[-d|-dots]}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Specify the range of intensity values to include:

pnmhistmap {{[-l|-lval]}} {{minval}} {{[-rv|-rval]}} {{maxval}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Code Snippets

Draw a histogram of a PNM image

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

Draw the histogram as dots instead of bars

pnmhistmap {{[-d|-dots]}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Specify the range of intensity values to include

pnmhistmap {{[-l|-lval]}} {{minval}} {{[-rv|-rval]}} {{maxval}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Context

tldr-pages: common/pnmhistmap

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