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The camera normally determines the optimal exposure given the semi-automatic or automatic settings selected by the user.  There are times, however, when it is advantageous to capture images that are slightly under and over-exposed. This is called bracketing.  The primary uses of bracketing include a fairly new technique called HDR.  Depending on the camera, the user may select from 3 to 9 images.  One image will have the optimal exposure while the rest will be underexposed and overexposed by an amount determined by the user (usually 1 stop).  Each camera has a special setting normally located in the settings are of the menu where the user selects various elements to set.


Also see: HDR.

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Reference: Wikipedia

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