#!/bin/sh
#
# Copyright (c) 2001 by ISHIKAWA, Hidenori <hideishi@magisystem.net>
#
# This script may be used, modified, copied or distributed in both
# source and binary as long as the above copyright and these terms
# are retained. 
#
# Although the author has debugged this patch with great care,
# under no circumstances is the author responsible for any damage
# incurred with its use.
#
# July, 2001  Tested on OpenBSD 2.9-current
#

error()
{
	echo 'usage: ppmgradation <width> <height> [from coluor] [to colour]'
	exit 255
}

if [ x"$1" == "x" -o x"$2" == "x" -o x"$3" == "x" -o x"$4" == "x" ]; then
	error
fi

pgmramp -tb ${1} ${2} | pgmtoppm ${3}-${4}