Canon POWERSHOT SD750 DIGITAL ELPH User Manual page 71

Your camera is equipped with an Intelligent Orientation sensor that
detects the orientation of an image shot with the camera held
vertically and automatically rotates it to the correct orientation when
viewing it in the LCD monitor.
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When the camera is held vertically to shoot, the Intelligent
Orientation sensor judges the upper end to be "up" and the
lower end to be "down". It then regulates the optimal white
balance, exposure and focus for vertical photography. This
function operates regardless of the on/off status of the Auto
Rotate function.
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