NAME

       pnmcut - cut a rectangle out of a portable anymap

SYNOPSIS

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

       All options may be abbreviated to the shortest unique prefix.

DESCRIPTION

       Reads a 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, top, 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.

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, pnmcut 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 can also fill an image out to a specified  dimension,  and  gives  you  more
              explicit control over the padding.

       -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.

                                           29 June 2000                                 pnmcut(1)