#!/bin/bash

SIG="$HOME/sig.png"
CONVERT_OPTIONS="-gravity SouthEast"

while [[ $# > 0 ]]
do
	echo -n "Signing $1... "
	convert "$1" $CONVERT_OPTIONS $SIG -composite "signed $1"
	exit=$?
	if [[ $exit != 0 ]]
	then
		echo "convert returned with bad status $exit."
		exit $exit
	else
		echo "done."
	fi
	shift
done