[Luyt]

Currently I'm using a matrix to determine adjacency, but I'll give this graph idea a try. Thanks for the tip!

PS. Have you actually realized a succesful implementation? (Just curious)

[webfuel]

No problem! Yes, I have this working:

http://webfuel.org/instaunshredderv2.php

It also works on the test images I created:

http://webfuel.org/a.png http://webfuel.org/b.png http://webfuel.org/c.png