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The variations of subject brightness encountered when doing landscape photography often exceed the range that can be captured with an acceptable exposure. Your eyes can see between fifteen and thirty stops of brightness in a single scene, but the camera is limited to not more than about five. The traditional way of dealing with this problem is the use of graduated neutral density filters to darken down the sky enough to fit better with the land. But the digital darkroom gives us a new solution: merging two exposures using digital blending....

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