HTML5 Elements for UNIX.COM Post: 303026516

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LEARN ABOUT SUNOS

pnmcrop

pnmcrop(1)                                                    General Commands Manual                                                   pnmcrop(1)

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)