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 {{[-b|-background]}} {{color}} {{angle}} {{path/to/input.pnm}} > {{path/to/output.pnm}}

• Disable anti-aliasing, improving performance but decreasing quality:

pnmrotate {{[-n|-noantialias]}} {{angle}} {{path/to/input.pnm}} > {{path/to/output.pnm}}