Reverse pinch
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A reverse pinch (sometimes also called “unpinch”) refers to a motion used to interact with multipoint touch screen interfaces, such as that employed on the Apple Inc. iPhone device [1]. The motion involves spreading two fingers (or thumb and finger) apart to signal the device to perform an action such as enlarging a picture or zooming in on an image. The opposite motion, i.e., pinching together the thumb and finger, leads to reducing the size of the image.
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The term "reverse pinch" has appeared on numerous web pages including
