ProScan PLT4311-PL User Manual page 23

Press on the thumbnail of a photo to access a full-sized version.
Get a closer look at a photo by double tapping the screen. Two taps will
magnify the image. Another two taps will return to the original view.
A tap on the screen, a thumbnail of photos will appear and you can tap on
any photo to move from one photo to another.
Enlarge an image by touching the image with two fingers and spreading
them toward the edges of the screen. Pinch the image back to original
size by bringing your index finger and thumb together.
See an image in widescreen perspective by turning the device on its side.
The device automatically rotates a photo as you move the device and
spreads the edges to comply with the view screen's orientation (this
function is only valid after Auto-rotate screen is activated from Setting
Display Auto-rotate screen).
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