pnmmargin
Add solid color borders to PNM images
TLDR
Add border around image
$ pnmmargin [10] [input.pnm] > [output.pnm]
Add colored border$ pnmmargin -color [blue] [20] [input.pnm] > [output.pnm]
SYNOPSIS
pnmmargin [options] size [file]
DESCRIPTION
pnmmargin adds a uniform solid-color border around all four sides of a PNM image. The border width is specified in pixels and is applied equally on all sides.
By default the border color is white. Use -color to specify a custom color, or the shortcuts -white and -black for common choices. This is a convenience wrapper around pnmpad. Part of the Netpbm toolkit.
PARAMETERS
size
Border width in pixels.-color color
Border color.-white
White border.-black
Black border.