xenial (1) pnmcrop.1.gz

NAME

       pnmcrop - crop a portable anymap

SYNOPSIS

       pnmcrop [-white|-black|-sides] [-left] [-right] [-top] [-bottom] [pnmfile]

       All options may be abbreviated to their shortest unique prefix or specified with double hyphens.

DESCRIPTION

       Reads a PBM, PGM, or PPM image as input.  Removes borders that are the background color, and produces the
       same type of image as output.

       If you don't specify otherwise, pnmcrop assumes the background color is whatever color the top  left  and
       right  corners of the image are and if they are different colors, something midway between them.  You can
       specify that the background is white or black with the -white and -black options or make pnmcrop base its
       guess on all four corners instead of just two with -sides.

       By  default,  pnmcrop chops off any stripe of background color it finds, on all four sides.  You can tell
       pnmcrop to remove only specific borders with the -left, -right, -top, and -bottom options.

       If you want to chop a specific amount off the side of an image, use pnmcut.

       If you want to add different borders after removing the existing ones, use pnmcat or pnmcomp.

OPTIONS

       -white Take white to be the background color.  pnmcrop removes borders which are white.

       -black Take black to be the background color.  pnmcrop removes borders which are black.

       -sides Determine the background color from the colors of the four corners of the  input  image.   pnmcrop
              removes borders which are of the background color.

              If  at  least  three  of the four corners are the same color, pnmcrop takes that as the background
              color.  If not, pnmcrop looks for two corners of the same color in the following order, taking the
              first  found as the background color: top, left, right, bottom.  If all four corners are different
              colors, pnmcrop assumes an average of the four colors as the background color.

              The -sides option slows pnmcrop down, as it reads the entire image  to  determine  the  background
              color in addition to the up to three times that it would read it without -sides.

       -left  Remove any left border.

       -right Remove any right border.

       -top   Remove any top border.

       -bottom
              Remove any bottom border.

       -verbose
              Print  on  Standard  Error  information  about the processing, including exactly how much is being
              cropped off of which sides.

SEE ALSO

       pnmcut(1), pnmfile(1), pnm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

                                                  18 March 2001                                       pnmcrop(1)