ABSTRACT
Metering is the method by which the exposure value of an image is determined. In any given scene, there is a range of light from dark to bright - it can be gloomy or well-lit, with limited or extreme contrast. The recording medium of the camera can only capture a certain range of brightness so the job of metering, whether in the form of a hand-held meter or one that is built into the camera, is to determine what value would best represent the middle tone of brightness in the image. Once the middle tone is set, the light and dark tones around it are captured by the camera. Bracketing is the use of exposure compensation to cover all bases. Instead of having one picture taken, the camera is set to bracket an exposure with either one or two settings on either side of the nominal exposure.
