--- Set the number of samples for supersampling. If this is set to a value of
--- two or greater, each frame will be rendered larger by the factor specified.
--- ImageMagick is used to scale the frames back down to size; if ImageMagick
--- is not installed, the resulting frames will end up bigger than they should
--- be and the aliasing problem will not be fixed.
-local supersample = 4
+-- Set the number of samples for supersampling. If this is set to a value
+-- of two or greater, each frame will be rendered larger by the factor
+-- specified. ImageMagick is used to scale the frames back down to size;
+-- if ImageMagick is not installed, this script will exit with error 1.
+local supersample = 2