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Most cameras have three metering modes, spot metering, center weighted and evaluative. When you spot meter you're taking a meter reading from a single spot of the image. What happens is the camera looks at that spot and meters from it to make that spot equate to mid grey.
Center weighted metering mode is measures the exposure around the center of the image as composed in the viewfinder and averages it out to be mid grey. And evaluative metering measures the entire image and all it's tones then creates an exposure that will make the entire image equate to - you guessed it, mid grey.
Before you can begin to understand how to use the different metering modes you have to be able to think in tones of grey and forget the colour. check out Metering Modes Explained - Part 1 (www.photography...) for an exercise on how to do this.
Mike Browne