For the prototype, he and his colleagues developed a program that instructs the camera to take two rapid shots if a frame has both dark and light parts. One shot exposes correctly for the dark; one shot exposes correctly for the light. The program then merges the two images into one, taking the best parts from each.
A photo of Zurich with the left side properly exposed.
A photo of Zurich with the right side properly exposed.
Combined, as they would be if taken by the Frankencamera, both photos create a photo of Zurich with each side properly exposed.
http://www.npr.org/templates/story/story.php?storyId=113692571&sc=fb&cc=fp
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