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pnmmargin

Add a border to a PNM image. More information: https://netpbm.sourceforge.net/doc/pnmmargin.html.

  • Add a border of the specified size to a PNM image:

pnmmargin {{size}} {{path/to/image.pnm}} > {{path/to/output.pnm}}

  • Specify the color of the border:

pnmmargin -color {{color}} {{size}} {{path/to/image.pnm}} > {{path/to/output.pnm}}