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pnmrotate

Rotate a PNM image. More information: https://netpbm.sourceforge.net/doc/pnmrotate.html.

Rotate a PNM image by some angle (measured in degrees, counter-clockwise):

pnmrotate {{angle}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Specify the background color exposed by rotating the input image:

pnmrotate -background {{color}} {{angle}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

Disable anti-aliasing, improving performance but decreasing quality:

pnmrotate -noantialias {{angle}} {{path/to/input.pnm}} > {{path/to/output.pnm}}