Pile images into a single image via stitching, as simple as that is I found a way to make that more complex than it has to be.
Disclaimer: I was hopped up on coffee and little sleep when I put most of this together, please forgive some of the vomit.
See releases for JARs ready for importing.
I've tried my best to fill out descriptive information for the Javadocs. Those by the way can be found here.
The wiki will have a few samples to look at. Hopefully they'll be good enough to demonstrate how to use Pile.
If you can add or improve something, go for it.