diff --git a/fourcell.sh b/fourcell.sh
index 7cd1e6b..aab6ec1 100644
--- a/fourcell.sh
+++ b/fourcell.sh
@@ -11,6 +11,16 @@ if [[ "${2}" == "" ]]; then
 	exit 2
 fi
 
+if [[ "${3}" == "" ]]; then
+	echo "Please an output directory for pages"
+	exit 3
+fi
+
+if [ ! -d "${3}" ]; then
+	echo "${3} output directory does not exist"
+	exit 4
+fi
+
 if [ -f "${2}" ]; then
 	echo "Exporting frames from ${2}..."
 	OUTPUT=$(mktemp -d)
@@ -79,9 +89,11 @@ for ((i=0;i<${PAGES};++i)); do
 		bash white_fourcell.sh $DPI "${f4}" "${dest}"
 		args="${args} ${dest}"
 	fi
-	bash apply_image.sh ~/Desktop/page_$i.tiff "${1}" ${args}
+	bash apply_image.sh ${3}/page_$i.tiff "${1}" ${args}
 done
 
+echo "Wrote ${3}/page_$i.tiff"
+
 # x determine dpi
 # convert frame to white_fourcell