If you don't like the built-in photo viewer in the Photos app in iOS, RotoView has a free solution for magnifying your photos and easily scrolling around with gestures and phone movements.
A double-tap on the screen zooms in. You can scroll by moving a finger and rotate an image by moving the phone. There's also something called "Throw and Glide." The Throw gesture rapidly scrolls enlarged photos in response to the way you tilt your phone at a rate much faster than the standard flick touch gesture. The Glide gesture follows the Throw gesture automatically with slower and more precise scrolling. The RotoView interface works well with touch gestures, providing a smooth transition between rotation and dra
