Canon IXUS 55 - Manual (Page 52)

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Adjust the exposure compensation setting to avoid making the
subject too dark when it is backlit or shot against a bright background
or to avoid making lights appear too bright in night shots.
To Cancel the Exposure Compensation
Restore the compensation value to [0].
Exposure compensation is not available in the or My
Colors mode.
In
mode, the exposure shift can be set/canceled (p. 43) .
Adjusting the Exposure Compensation
Shooting Mode
1 FUNC. Menu * (Exposure Compensation).
See Menus and Settings (p. 26) .
*Default setting.
Use the or button to adjust
the exposure compensation and
press the FUNC./SET button.