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#! /bin/bash
# This script tests: ppmmix
# Also requires: pamdepth pamenlarge pamsumm pbmmake
# Also requires: pgmtopgm pnminvert ppmtopgm
# Print a pretty checkerboard pattern
${PBM_BINPREFIX}pbmmake -g 8 8 | \
${PBM_BINPREFIX}pgmtopgm > ${tmpdir}/a1.pgm &&
${PBM_BINPREFIX}pbmmake -g 2 2 | ${PBM_BINPREFIX}pamenlarge 4 | \
${PBM_BINPREFIX}pgmtopgm > ${tmpdir}/a2.pgm &&
${PBM_TESTPREFIX}ppmmix 0.75 ${tmpdir}/a1.pgm ${tmpdir}/a2.pgm -plain | \
${PBM_BINPREFIX}ppmtopgm | ${PBM_BINPREFIX}pamdepth 3 -plain &&
rm ${tmpdir}/a1.pgm ${tmpdir}/a2.pgm
# Mix image with itself.
# Output should match input regardless of ratio.
for i in 0 0.5 0.6 1
do
${PBM_TESTPREFIX}ppmmix $i testimg.ppm testimg.ppm | cksum
done
# Mix image with its own inverse.
# Output should be a monotone gray sheet.
${PBM_BINPREFIX}pnminvert testimg.ppm | ${PBM_TESTPREFIX}ppmmix .5 \
testimg.ppm - | tee ${tmpdir}/a3.ppm | \
${PBM_BINPREFIX}pamsumm -brief -max &&
${PBM_BINPREFIX}pamsumm -brief -min ${tmpdir}/a3.ppm &&
rm ${tmpdir}/a3.ppm
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