A mixed bag of interaction and expectation... You are using the photo app on the iP(hone/od/ad) you know there are a few familiar gestures to interact. Tap to select an image. Swipe left or right ...
On touch screen devices, there appears to have evolved a standard set of gestures, e.g. pinch and spread with two fingers for zoom in and zoom out swipe with one finger to scroll a document We're ...