I've used Realviz stitcher for a few years. It's not cheap but it's increadibly easy to use and seems to offer the most flexibility and the best image quality. No limits to the number or orientation of you source images.
Used heavily in the film vfx world. you can download a trial version to try it out.. hope this helps http://www.realviz.com/products/st/index.php pete =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
