test/tiff-flate-lzw-roundtrip.test


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#! /bin/bash
# This script tests: pamtotiff tifftopnm
# Also requires: ppmpat

# Failure message
## If tiff-rountrip.test succeeds and this test fails, the likely
## cause is an old TIFF library which lacks certain compression
## features.

tmpdir=${tmpdir:-/tmp}

tartan_ppm=${tmpdir}/testimg40.ppm

# Make a test image with reduced colors which compresses better
# cksum is 1079668603 10237

ppmpat -tartan --color=rgb:32/0d/b7,rgb:31/58/a3,rgb:e9/5e/d4 71 48 | \
  tee ${tartan_ppm} | cksum
pamtotiff ${tartan_ppm} | tifftopnm | cksum

# test flate compression
pamtotiff -flate ${tartan_ppm} | tifftopnm | cksum

# test adobeflate compression
pamtotiff -adobeflate ${tartan_ppm} | tifftopnm | cksum

# test LZW compression
pamtotiff -lzw ${tartan_ppm} | tifftopnm | cksum
pamtotiff -lzw -predictor=1 ${tartan_ppm} | tifftopnm | cksum

# PBM image: test flate compression
pamtotiff -flate testgrid.pbm | tifftopnm | cksum

rm ${tartan_ppm}