We all know that photographing on snow means that exposure meters err on the side of underexposure. Meters are programmed to understand 'middle gray', or middle tones, and to meters white snow looks gray. Therefore, they underexpose the pictures in an attempt to make the snow gray. With black, the same thing occurs but in reverse. The black is interpreted as middle gray, and the meter tries to make it light . . . like gray. I took this portrait in Morocco, and I had to watch carefully that the image wasn't overexposed. If you are aware of the issue, it's easy to prevent problems. Just use the exposure compensation feature built into the camera to tweak the exposure.
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