Canon PowerShot SD900 User Manual page 90

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.
FUNC. Menu
~
Em
* (Exposure Compensation).
See Menus and Settings (p. 22).
*Default setting.
eUse the. or .. button to adjust
the exposure compensation and
press the FUNC.lSET button.
To Cancel the Exposure Compensation
Restore the compensation value to [0].
52
Iil,n
mode, the exposure shift can be set/canceled (p. 42).