> If you’re willing to leave the script running for a few hours, you can increase the image resolution on line 8. (Just make sure the width is divisible by 4.)

You can make a lower resolution version too. I used:

    )  ;v,      x=1024, 800;C=range(v*x

which fakes the 4-width with a space before 800, and it worked fine: http://i.imgur.com/c9ossnw.png

I like this use of obfuscation a lot. Kudos to the author. (EDIT: Code format)