diff --git a/stipple.sh b/stipple.sh
index afa4599..77c6374 100644
--- a/stipple.sh
+++ b/stipple.sh
@@ -1,24 +1,33 @@
 #!/bin/bash
 
+if [[ "${1}" == "" ]]; then
+	echo "Please provide a directory of images as the first argument"
+	exit 1
+fi
+
 INPUT=`realpath "${1}"`
 OUTPUT=`realpath "${2}"`
 INVERT="${3}"
 
-if [[ "${INVERT}" == "" ]]; then
-	INVERT="false"
-else
-	INVERT="true"
+if [ ! -d "${INPUT}" ]; then
+	echo "Directory ${1} doesn't exist"
+	exit 2
 fi
 
+mkdir -p "${OUTPUT}"
+
+
+
 WIDTH=404
 HEIGHT=374
 DOTSIZE=4
 MAXGENERATIONS=25
-MAXPARTICLES=500
+MAXPARTICLES=400
 MINDOTSIZE=0.8
 LINE=0.8
 FILL=true
 MODE="stipple"
+INVERT="false"
 
 IMAGES=""
 
@@ -36,6 +45,7 @@ for png in "${INPUT}/"*.png ; do
 		VIDEO="${OUTPUT}/${part}.mov"
 	fi
 	bash stipple_gen.sh \
+		--display "false" \
 		--inputImage "${tmp}" \
 		--outputImage "${OUTPUT}/${name}_rendered.png" \
 		--outputSVG "${OUTPUT}/${name}.svg" \
@@ -51,6 +61,11 @@ for png in "${INPUT}/"*.png ; do
 		--maxParticles $MAXPARTICLES \
 		--mode $MODE \
 		--invert $INVERT
+
+	if [[ "${INVERT}" != "" ]]; then
+		convert "${OUTPUT}/${name}_rendered.png" -channel RGB -negate "${OUTPUT}/${name}_rendered.png"
+	fi
+
 	rm "${tmp}"
 	cd ~/src/animation/
 	if [ "${MODE}" != "tsp" ]; then
@@ -60,6 +75,6 @@ for png in "${INPUT}/"*.png ; do
 	fi
 done
 
-ffmpeg -r 12 -f image2 -i "${IMAGES}" \
+ffmpeg -y -r 12 -f image2 -i "${IMAGES}" \
 	-c:v prores_ks -profile:v 3 \
 	"${VIDEO}"