diff --git a/run.sh b/run.sh
index 450eea1..c39e2a6 100755
--- a/run.sh
+++ b/run.sh
@@ -1,25 +1,47 @@
 #!/bin/sh
 
-start="1.0"
-end="1.0e+30"
-frames="14400"
+if [ $# -ne 8 ]; then
+	echo "usage: $0 startmag endmag frames method width height centerx centery"
+	echo ""
+	echo "   startmag  start magnification"
+	echo "   endmag    end magnification"
+	echo "   frames    number of frames to generate over the magnification range"
+	echo "   method    name of executable to use for mandelbrot generation"
+	echo "   width     width of the images"
+	echo "   height    height of the images"
+	echo "   centerx   x zoom coordinate"
+	echo "   centery   y zoom coordinate"
+	echo ""
+	echo "example:"
+	echo ""
+	echo "   $0 1.0 1.0e+30 14400 mandel_dd_aa 1920 1080 -0.743643887037158704752191506114774 0.131825904205311970493132056385139"
+	exit
+fi
 
-magn=`python -c "from math import pow; fac = pow($end / $start, 1.0 / ($frames - 1)); print \"\\n\".join([ str($start * pow(fac, i-1)) for i in range(1, $frames + 1)])"`
+start="$1"
+end="$2"
+frames="$3"
+method="$4"
+width="$5"
+height="$6"
+centerx="$7"
+centery="$8"
 
-centerx="-0.743643887037158704752191506114774"
-centery="0.131825904205311970493132056385139"
+magn=`python -c "from math import pow; fac = pow($end / $start, 1.0 / ($frames - 1)); print \"\\n\".join([ str($start * pow(fac, i-1)) for i in range(1, $frames + 1)])"`
 
 i=0
 for mag in $magn; do
-	pngname=`printf "out_%05d_%s.png" $i $mag`
+	pngname=`printf "out_%05d.png" $i`
 	if [ -s "$pngname" ]; then
 		i=$((i+1))
 		continue
 	fi
 	echo $i $mag
-	fname=`printf "out_%05d_%s.ppm" $i $mag`
-	/usr/bin/time -f "%e s" ./mandel_dd 320 240 $centerx $centery $mag > "$fname"
+	fname=`printf "out_%05d.ppm" $i`
+	/usr/bin/time -f "%e s" "./$method" $width $height $centerx $centery $mag > "$fname"
 	convert "$fname" -format png "$pngname"
+	optipng -o4 -i0 "$pngname" > /dev/null 2>&1
+	advpng -z4 "$pngname" > /dev/null 2>&1
 	rm "$fname"
 	i=$((i+1))
 done