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

SYNOPSIS
    pamcut [-left leftcol] [-right rightcol] [-top toprow] [-bottom bottom-
    row] [-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, -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, 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, respec-
    tively. (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 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, 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.