Spot Metering
When the auto-exposure program of camera failed, the main object may be underexposure. In this case you can use the Spot Metering function to correct it. The principle of spot metering is the same as that in camera. User place the metering rectangle over the underexposure part, click it to recalculate the exposure.
Enter the function:
Click 'Exposure' button on function bar, then select 'Correct it by click', or select 'Spot Metering' from its popup menu.
The interface and the description:

As the figure, it is a backlighting photo, the face of model is underexposure. Move the metering rectangle to the face of the model and click it.
You can see the result:

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