visdiff

#/bin/bash

FILE_A=$1
FILE_B=$2

if [ ! -f "${FILE_A}" ]; then
    echo "File ${FILE_A} could not be found"
    exit 1
fi

if [ ! -f "${FILE_B}" ]; then
    echo "File ${FILE_B} could not be found"
    exit 1
fi

TEMP_FILE_A=$(mktemp --suffix=".png")
convert -colorspace gray $FILE_A $TEMP_FILE_A

TEMP_FILE_B=$(mktemp --suffix=".png")
convert -colorspace gray $FILE_B $TEMP_FILE_B

TEMP_FILE_DIFF=$(mktemp --suffix=".png")
composite -stereo 0 $TEMP_FILE_A $TEMP_FILE_B $TEMP_FILE_DIFF

display $TEMP_FILE_DIFF

rm $TEMP_FILE_A $TEMP_FILE_B $TEMP_FILE_DIFF