OK, yeah, so I was curious what a single movie average would look like. Here's the first level of SMB, more or less:
I don't know, kind of lame. I did this the carpal tunnel inducing way of repeatedly hitting frame advance and screenshot hotkey 1000 times.
Oh, and here's the magick part:
1 Download ImageMagick
2 Get a directory full of png's (or whatever) that are the same size
3 Go to that directory and type 'convert *.png -average output.png'
4 ???
5 Profit
It's pretty complicated.
Lua has no screenshot support "AFAICT" but Warp's proposed solution is actually pretty rad. It would also probably be a hell of a lot faster than waiting a friggin hour while ImageMagick averages 1000 pictures.
OK, someone who is smarter and has more time than me, let's see some more pictures!
Oh, and everyone wins the game. If you are stumped, look at the file names.