NationMaster - Encyclopedia: Double exposure

In film and photography, double exposure is a technique in which a piece of film is exposed twice, to two different images. The resulting photographic image shows the second image superimposed over the first. The technique can be used to create ghostly images or to add people and objects to a scene that were not originally there. It is frequently used in photographic hoaxes.

Categories: Photographic techniques | Photographic terms | Movie stubs

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Exposure (photography) - Wikipedia, the free encyclopedia (673 words)
	In photography, exposure is the total amount of light allowed to fall on the photographic medium (photographic film or image sensor) during the process of taking a photograph.
	Exposure is a combination of the length of time and the level of illumination received by the photosensitive material.
	Exposure time is controlled in a camera by shutter speed and the illumination level by the lens aperture.

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