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#! /bin/bash
# This script tests: ppmmix
# Also requires: pamdepth pamenlarge pamsumm pbmmake
# Also requires: pgmtopgm pnminvert ppmtopgm
alias ppmmix="${PBM_TESTPREFIX}ppmmix"
alias pamdepth="${PBM_BINPREFIX}pamdepth"
alias pamenlarge="${PBM_BINPREFIX}pamenlarge"
alias pamsumm="${PBM_BINPREFIX}pamsumm"
alias pbmmake="${PBM_BINPREFIX}pbmmake"
alias pgmtopgm="${PBM_BINPREFIX}pgmtopgm"
alias pnminvert="${PBM_BINPREFIX}pnminvert"
alias ppmtopgm="${PBM_BINPREFIX}ppmtopgm"
shopt -s expand_aliases
tmpdir=${tmpdir:-/tmp}
# Test 1. Print a pretty checkerboard pattern
a1_pgm=${tmpdir}/a1.pgm
a2_pgm=${tmpdir}/a2.pgm
pbmmake -g 8 8 | \
pgmtopgm > ${a1_pgm} &&
pbmmake -g 2 2 | pamenlarge 4 | \
pgmtopgm > ${a2_pgm} &&
ppmmix 0.75 ${a1_pgm} ${a2_pgm} -plain | \
ppmtopgm | pamdepth 3 -plain &&
rm ${a1_pgm} ${a2_pgm}
# Mix image with itself.
# Output should match input regardless of ratio.
for i in 0 0.5 0.6 1
do
ppmmix $i testimg.ppm testimg.ppm | cksum
done
# Mix image with its own inverse.
# Output should be a monotone gray sheet.
a3_ppm=${tmpdir}/a3.ppm
pnminvert testimg.ppm | ppmmix .5 \
testimg.ppm - | tee ${a3_ppm} | \
pamsumm -brief -max &&
pamsumm -brief -min ${a3_ppm} &&
rm ${a3_ppm}
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