pnmpad

Add borders to a PNM image. See also: pnmmargin, pamcut, pamcomp. More information: https://netpbm.sourceforge.net/doc/pnmpad.html.

• Add borders of the specified sizes to the image:

pnmpad -left {{100}} -right {{150}} -top {{123}} -bottom {{456}} {{path/to/image.pnm}} > {{path/to/output.pnm}}

• Pad the image to the specified size:

pnmpad -width {{1000}} -height {{500}} {{path/to/image.pnm}} > {{path/to/output.pnm}}

• Pad the width of the image to the specified size, controlling the ratio between right and left padding:

pnmpad -width {{1000}} -halign {{0.7}} {{path/to/image.pnm}} > {{path/to/output.pnm}}

• Pad the width of the image using the specified color:

pnmpad -width {{1000}} -color {{red}} {{path/to/image.pnm}} > {{path/to/output.pnm}}