In the iPhone sample code \"PhotoScroller\" from WWDC 2010, they show how to do a pretty good mimmic of the Photos app with scrolling, zooming, and paging of images. They al
I've found this which may be of help: http://www.mikelin.ca/blog/2010/06/iphone-splitting-image-into-tiles-for-faster-loading-with-imagemagick/
You just run it in the Terminal as a shell script on your Mac.
Terminal