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