#!/bin/sh

set -x

convert -size 1000x1000 canvas:white date1.png
sleep 2
convert -size 1000x1000 canvas:white date2.png

sleep 2
convert -size 1000x1000 canvas:white date1.jpg
sleep 2
convert -size 1000x1000 canvas:white date2.jpg

#f="+set date:create +set date:modify"
#f="-define png:exclude-chunks=time"
#f="-define png:exclude-chunks=tIME"
f="-define png:exclude-chunks=date,time"
#f="-define png:exclude-chunks=date -define png:exclude-chunks=time"

sleep 2
convert -size 1000x1000 canvas:white $f nodate1.png
sleep 2
convert -size 1000x1000 canvas:white $f nodate2.png


identify -verbose date1.png > date1.png.i
identify -verbose date2.png > date2.png.i

identify -verbose date1.png > date1.jpg.i
identify -verbose date2.png > date2.jpg.i

identify -verbose nodate1.png > nodate1.png.i
identify -verbose nodate2.png > nodate2.png.i

openssl md5 date[12].png
openssl md5 date[12].jpg
openssl md5 nodate[12].png

diff -u date1.png.i date2.png.i
diff -u date1.jpg.i date2.jpg.i
diff -u nodate1.png.i nodate2.png.i