pnmcut(1)

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)

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