#! /bin/bash
# This script tests: pnmquantall
# Also requires: ppmtorgb3 pgmhist

ppmtorgb3 testimg.ppm

pnmquantall 20 testimg.red testimg.grn testimg.blu

for i in testimg.red testimg.grn testimg.blu
do
cksum $i
done

# Should print 1

pnmcat testimg.red testimg.grn testimg.blu -tb | \
    pgmhist -m | awk '$2>0 {s++}; END { print (s<=20) }'