I was trying to do that by saving locally, but FireFox refuses to allow getImageData on an image loaded from the filesystem by a web page loaded from the filesystem, with an NS_ERROR_DOM_SECURITY_ERR
Anyway, I will now try with your set-your-own-image version.
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I envy you :).
You may try to run it on different images, I just added new experimental feature: you can set your own target image.
This does crash JavaScript sometimes on some images (for unknown reasons). If this happens, just reload the page.
I was trying to do that by saving locally, but FireFox refuses to allow getImageData on an image loaded from the filesystem by a web page loaded from the filesystem, with an NS_ERROR_DOM_SECURITY_ERR
Anyway, I will now try with your set-your-own-image version.
You can run it locally if it is on your local webserver (http://localhost) instead of just filesystem (file://).
That's how I work on it (XAMPP).
http://en.wikipedia.org/wiki/Xampp