Canon POWERSHOT SX100 IS User Manual page 66

Playback!Erasing 1133
In playback mode, you can select images with the control dial. Turning
it counterclockwise selects the previous image while turning it
clockwise selects the next image. Please also see Viewing Still Images
(p. 17).
I 0, Magnifying Images []
To Cancel the Magnified Display:
Press the zoom lever toward _. (You can also cancel it immediately
by pressing the MENU button.)
Movie frames and index playback images cannot be magnified_