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#!/bin/sh
# A very simple script using OutGuess to find an image that yields
# the best embedding.
# (C) 1999 Niels Provos
FILES=*.jpg
MESSAGE=/tmp/fortune
TMPNAME="out.$$.jpg"
OUTPUT="out.jpg"
ARGS="-d $MESSAGE"
OUTGUESS="outguess"
BEST=0
WORST=0
NAME="no name"
if [ ! -f "$MESSAGE" ] ; then
echo "The file $MESSAGE does not exist"
exit
fi
for name in $FILES
do
echo -n "$name "
RESULT=`$OUTGUESS $ARGS $name $TMPNAME 2>&1 |grep "^Total" | awk '{print $4}'`
if [ -z "$RESULT" ] ; then
rm $TMPNAME
echo "not possible to embed data"
continue;
else
echo "Bits changed $RESULT"
fi
if [ $WORST -eq 0 -o $RESULT -gt $WORST ] ; then
WORST=$RESULT
fi
if [ $BEST -eq 0 -o $RESULT -lt $BEST ] ; then
BEST=$RESULT
NAME=$name
mv $TMPNAME $OUTPUT
echo NEW best image: $name
else
rm $TMPNAME
fi
done
echo Best data object was $NAME with $BEST. Worst result was $WORST.
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