diff --git a/greenscale.sh b/greenscale.sh
index 161e280..f43e7f2 100644
--- a/greenscale.sh
+++ b/greenscale.sh
@@ -1,8 +1,10 @@
 #!/bin/bash
 
-convert animation.gif frame%02d.gif
+convert animation.gif -coalesce frame%02d.gif
+
+convert frame*.gif -resize 640x480 -gravity center -background white -extent 640x480 -compress none -scale 56x100% -resize 40x48\! \
+-colorspace Gray -colors 16 -depth 8 -auto-level -evaluate divide 17 %02d.gray
 
-convert frame*.gif -compress none -scale 56x100%  -scale 40x48\! -colorspace Gray -colors 16 -depth 8 -auto-level -evaluate divide 17 %02d.gray
 
 for file in *.gray
 do