Samsung GalaxySIII User Manual page 62

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Pinch: "Pinch" the screen using your thumb and forefinger to
zoom out when viewing a picture or a Web page. (Move fingers
inward to zoom out.)
•
Spread: "Spread" the screen using your thumb and forefinger to
zoom in when viewing a picture or a Web page. (Move fingers
outward to zoom in.)
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Note: These screens can be re-arranged in any desired order.
Pinch (Zoom Out)
Note: Motion must be enabled for this feature to be active. For
Spread (Zoom In)
For more information, refer to "Customizing the
Screens" on page 61.
•
Motion Navigation and Activation: The device comes equipped
with the ability to assign specific functions to certain device
actions that are detected by both the accelerometer and
gyroscope.
more information, refer to "Motion Settings" on page
283.