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)