Compares two folders of files and outputs diffs (if any) to a folder called diffs

compare_images.sh

# compare_images.sh
# Requires imagemagick `brew update && brew install imagemagick`

for entry in "$1"/*
do
  if [ -f "$entry" ];then
    NAME=`basename "$entry"`
    DIFF=`compare -metric AE "$1/$NAME" "$2/$NAME" null: 2>&1`;

    if [ "${DIFF}" -eq "0" ]; then
    	echo "No difference: $NAME";
	else
		echo "Visual difference: $NAME";
		`compare "$1/$NAME" "$2/$NAME" -compose src "diffs/$NAME"`;
		`cp "$1/$NAME" "diffs/${NAME%.*}_${1}.png"`
		`cp "$2/$NAME" "diffs/${NAME%.*}_${2}.png"`
    fi
  fi
done