Choosing a Digital Camera Metering Mode

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1

When the background is much brighter or darker than the subject, use center-weighted or spot metering.

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In matrix metering mode, your subject may be underexposed or overexposed because the camera adjusts the exposure to account for the brightness of the background.

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2

Frame the shot with the subject at the center.

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You can also use spot or center-weighted metering without the subject in the center of the picture.

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3

Press the shutter button halfway to lock in the exposure and then reframe the picture, if you want.

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As long as you keep the shutter button halfway down, the camera retains the initial exposure setting.

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4

Press the shutter button completely down.

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This takes your picture.

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Source:http://www.dummies.com/how-to/content/choosing-a-digital-camera-metering-mode.html