This is a free version of the ImageViewer Onefinger zoom,which has advertisement.You can pinch zoom by one finger.And also you can rotate an image by one finger.Image is instantly zoomed In/out.I introduced new gesture of zoom-In/out. So, You better watch the HowTo video on the youtube site.Its title is "one finger zoom image viewer.http://www.youtube.com/watch?v=0DxIgYkuF7Q