pamcut(1)

NAME

   pamcut - cut a rectangle out of a PAM, PBM, PGM, or PPM image

SYNOPSIS

   pamcut   [-left  leftcol]  [-right  rightcol]  [-top  toprow]  [-bottom
   bottomrow] [-width width] [-height height]  [-pad]  [-verbose]  [  left
   right width height ] [pnmfile]

   All options may be abbreviated to the shortest unique prefix.

DESCRIPTION

   Reads  a  PAM, PBM, PGM, or PPM image as input.  Extracts the specified
   rectangle, and produces the same kind of image as output.

   There are two ways to specify  the  rectangle  to  cut:  arguments  and
   options.  Options are easier to remember and read, more expressive, and
   allow you to use defaults.   Arguments  were  the  only  way  available
   before July 2000.

   If you use both options and arguments, the two specifications get mixed
   in an unspecified way.

   To use options, just code any  mixture  of  the  -left,  -right,  -top,
   -bottom, -width, and -height options.  What you don't specify defaults.
   It is an error to overspecify, i.e. to  specify  all  three  of  -left,
   -right, and -width or -top, -bottom, and -height.

   To  use  arguments,  specify  all  four  of the left, right, width, and
   height arguments.  left and top have the same effect as specifying them
   as  the  argument  of  a -left or -top option, respectively.  width and
   height have the same effect as specifying them as  the  argument  of  a
   -width or -height option, respectively, where they are positive.  Where
   they are not positive, they have the same effect as specifying one less
   than  the  value  as  the  argument  to  a  -right  or  -bottom option,
   respectively.  (E.g.  width = 0 makes the cut go all  the  way  to  the
   right  edge).   Before July 2000, negative numbers were not allowed for
   width and height.

   Input is from Standard Input  if  you  don't  specify  the  input  file
   pnmfile.

   Output is to Standard Output.

   If  you  are  splitting  a single image into multiple same-size images,
   pamdice is faster than running pamcut multiple times.

OPTIONS

   -left  The column number of the leftmost column to be  in  the  output.
          If a nonnegative number, it refers to columns numbered from 0 at
          the left, increasing to the right.  If negative,  it  refers  to
          columns numbered -1 at the right, decreasing to the left.

   -right The  column  number of the rightmost column to be in the output,
          numbered the same as for -left.

   -top   The row number of the topmost row to be in  the  output.   If  a
          nonnegative number it refers to rows numbered from 0 at the top,
          increasing downward.  If negative, it refers to columns numbered
          -1 at the bottom, decreasing upward.

   -bottom
          The  row  number  of  the  bottom-most  row to be in the output,
          numbered the same as for -top.

   -width The number of columns to be in the output.  Must be positive.

   -height
          The number of rows to be in the output.  Must be positive.

   -pad   If the rectangle you specify is not entirely  within  the  input
          image, pamcut fails unless you also specify -pad.  In that case,
          it pads the output with black up to the edges you specify.   You
          can  use  this  option  if  you need to have an image of certain
          dimensions and have an image of arbitrary dimensions.

          pnmpad also adds borders to an  image,  but  you  specify  their
          width directly.

   -verbose
          Print information about the processing to Standard Error.

SEE ALSO

   pnmcrop(1), pnmpad(1), pnmcat(1), pgmslice(1), pnm(5)

AUTHOR

   Copyright (C) 1989 by Jef Poskanzer.

                            03 August 2000                       pamcut(1)

---

Free and Open Source Software