Invisible Flash Takes Night Photos Without the Burst of (Visible) Light

By Anna Maria Jakubek Posted 07.17.2009

Finally: a flash camera without all the usual problems. By using a flashbulb that emits ultraviolet and infrared light (neither of which the human eye can detect) instead of visible light, New York University's Dilip Krishnan and Rob Fergus have come up with dark photography that will neither blind your subject nor produce the unwanted glare of a harsh flash in the developed photo.

On their own, IR and UV exposures produce photos that have strange, unrealistic coloring. But Krishnan and Fergus have taken care of that as well. Their system processes IR and UV exposures into true color, by combining two photos taken in quick succession into a superior final image.

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