I have some document scans of 11x17 documents that were scanned in two (2) 8x11 sheets. I need to stitch these together. I don't do this a lot and these are only grey scale images so image quality isn't a huge deal. Is there anything free and easy out there to combine two scanned documents into one? I have access to pixmator, but never got a chance to figure out how to use it yet. I really just have about 20 mages I need to turn back into 10.