Canon EOS Rebel XS Instruction Manual page 77

[_ Changing the Metering Mode*
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The metering mode is the method of measuring the brightness of the
subject Normally evaluative metering is recommended.
Press the <_ [_> button,
_ [Metering mode} will appear
'_ Select the metering mode.
_ Pressthe <AV> key to select the
metering mode, then press <8>.
D
Evaluative metering
This is an all-around metering mode suited for
portraits and even backiit subjects. The camera
sets the exposure automatically to suit the scene
This metedng mode is set automatically in the
Basic Zone modes.
Partial metering
Effective when the background is much brighter
than the subject due to backlighting, etc. The gray
area in the left figure is where the metering is
weighted to obtain the standard exposure.
D Center-weighted average metering
The metering is weighted at the center and then
averaged for the entire scene. This metering mode
is for advanced users.
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