Pixel Sort/Smear [Processing Edition]

This is a Processing sketch / script aimed at students, beginners, and tinkerers that will take any image (yes, you can import your own!), access the pixel array and mess with it in beautiful, interesting ways.

(I've also included 3 images + the output of one of them for you to play with!)

Everything is explained in great detail, and you don't even need to know what you're doing in order for it to work; all you need to do is trust the process(ing?) and check out the options I've included so that you can do really fun things with images!

No external libraries are required, just a copy of Processing (and Python mode, which you can download directly from the IDE itself) and this sketch are all you need.