Canon EOS Rebel XTI - Manual (Page 73)

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The metering mode is the method of measuring the brightness of the
subject. In the Basic Zone modes, evaluative metering is set. This need
not be changed unless you really want to.
1
Press the <YQ> button.
X [Metering mode] will appear.
2
Select the metering mode.
Press the <U> key to select the
desired metering mode.
When you press the shutter button
halfway, the selected metering mode
will be displayed on the LCD monitor.
q Evaluative metering
This is an all-around metering mode suited for portraits and
even backlit subjects. The camera sets the exposure
automatically to suit the scene.
w Partial metering
This is effective for backlit subjects when the light
surrounding the subject is strong. The gray area in the left
figure is where the metering is weighted to obtain the
standard exposure.
e Center-weighted average metering
This is for advanced users for obtaining the correct
exposure for backlit subjects and other scenes
using appropriate exposure compensation.
q Changing the Metering ModeN