test/pamditherbw.test


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#! /bin/sh
# This script tests: pamditherbw
# Also requires: pamchannel pamtopnm

tmpdir=${tmpdir:-/tmp}
test_red=${tmpdir}/testimg.red

# Test 1.  Simple threshold
echo "Test: simple threshold"

pamchannel -infile=testimg.ppm -tupletype="GRAYSCALE" 0 | pamtopnm | \
  tee ${test_red} | \
  pamditherbw -threshold -val=0.5 | cksum


# Test 2. Hilbert
echo "Test: Hilbert"
pamditherbw -hilbert ${test_red} | cksum
pamditherbw -hilbert -clump=4   ${test_red} | cksum
pamditherbw -hilbert -clump=16  ${test_red} | cksum
pamditherbw -hilbert -clump=100 ${test_red} | cksum

# Test 3. Dither-8
echo "Test: Dither-8"
pamditherbw -dither8 ${test_red} | cksum

# Test 4. Cluster-3
echo "Test: Cluster-3"
pamditherbw -cluster4 ${test_red} | cksum

# Test 5. Cluster-4
echo "Test: Cluster-4"
pamditherbw -cluster4 ${test_red} | cksum

# Test 6. Cluster-8
echo "Test: Cluster-8"
pamditherbw -cluster8 ${test_red} | cksum


echo "Test: Invalid"

. ./test-invalid.inc

invCmd "pamditherbw -fs -atkinson       ${test_red}"
invCmd "pamditherbw -floyd -atkinson    ${test_red}"
invCmd "pamditherbw -dither8  -cluster3 ${test_red}"
invCmd "pamditherbw -cluster3 -cluster4 ${test_red}"
invCmd "pamditherbw -cluster3 -cluster8 ${test_red}"
invCmd "pamditherbw -cluster4 -cluster8 ${test_red}"
invCmd "pamditherbw -hilbert -threshold ${test_red}"
invCmd "pamditherbw -clump=8            ${test_red}"
invCmd "pamditherbw -fs -clump=8        ${test_red}"
invCmd "pamditherbw -hilbert -clump=1   ${test_red}"
invCmd "pamditherbw -th -value=-1       ${test_red}"
invCmd "pamditherbw -th -value=1.1      ${test_red}"

rm ${test_red}