pamcut
Cut out a rectangular region from a Netpbm image.
See also: pamcrop, pamdice, pamcomp.
More information: https://netpbm.sourceforge.net/doc/pamcut.html.
- Discard the specified number of columns/rows on each side of the image:
pamcut -cropleft value -cropright value -croptop value -cropbottom value path/to/image.ppm > path/to/output.ppm
- Keep only the columns between the specified columns (inclusively):
pamcut -left value -right value path/to/image.ppm > path/to/output.ppm
- Fill missing areas with black pixels if the specified rectangle does not entirely lie within the input image:
pamcut -top value -bottom value -pad path/to/image.ppm > path/to/output.ppm