#! /bin/bash
# This script tests: hdifftopam pamtohdiff
# Also requires: 

  alias hdifftopam="${PBM_TESTPREFIX}hdifftopam"
  alias pamtohdiff="${PBM_TESTPREFIX}pamtohdiff"
  shopt -s expand_aliases

pamtohdiff testimg.ppm | \
  hdifftopam -pnm | cksum