pnmcut

pnmcut(1)                   General Commands Manual                  pnmcut(1)

NAME
       pnmcut - cut a rectangle out of a portable anymap

SYNOPSIS
       pnmcut [-left leftcol] [-right rightcol] [-top toprow] [-bottom bottom-
       row] [-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 rec-
       tangle, and produces the same kind of image as output.

       There are two ways to specify the rectangle to cut: arguments  and  op-
       tions.   Options  are easier to remember and read, more expressive, and
       allow you to use defaults.  Arguments were the only way  available  be-
       fore 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, -bot-
       tom, -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).   Be-
       fore July 2000, negative numbers were not allowed for width and height.

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

       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, num-
              bered 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 di-
              mensions 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)