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pnmcrop(1)							    pnmcrop(1)

NAME
       pnmcrop - crop a portable anymap

SYNOPSIS
       pnmcrop	[-white|-black|-sides] [-left] [-right] [-top] [-bottom] [pnm‐
       file]

       All options may be abbreviated to their shortest unique prefix or spec‐
       ified 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  bor‐
       ders 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 cor‐
	      ners 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, pnm‐
	      crop 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,  bot‐
	      tom.   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)
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