#! /bin/bash
# This script tests: pamditherbw
# Also requires: pamchannel pamtopnm
tmpdir=${tmpdir:-/tmp}
test_red=${tmpdir}/testimg.red
# Test 1. Simple threshold
pamchannel -infile=testimg.ppm -tupletype="GRAYSCALE" 0 | pamtopnm | \
tee ${test_red} | \
pamditherbw -threshold -val=0.5 | cksum
# Test 2. Floyd-Steinberg
#pamditherbw -floyd -val=0.5 ${test_red} | cksum
# Test 3. Atkinson
#pamditherbw -atkinson -val=0.5 ${test_red} | cksum
# Test 4. Hilbert
pamditherbw -hilbert ${test_red} | cksum
# Test 5. Dither-8
pamditherbw -dither8 ${test_red} | cksum
# Test 6. Cluster4
pamditherbw -cluster4 ${test_red} | cksum
# Test 7. Atkinson
#pamditherbw -atkinson -val=0.5 ${test_red} | cksum
rm ${test_red}