Multiple Exposure

multiple exposure by christoffer relander

In photography and cinematography, a multiple exposure is the superimposition of two or more exposures to create a single image, and double exposure has a corresponding meaning in respect of two images. The exposure values may or may not be identical to each other. Ordinarily, cameras have a sensitivity to light that is a function of time. For example, a one second exposure is an exposure in which the camera image is equally responsive to light over the exposure time of one second. The criterion for determining that something is a double exposure is that the sensitivity goes up and then back down.

The simplest example of a multiple exposure is a double exposure without flash, i.e. two partial exposures are made and then combined into one complete exposure. Some single exposures, such as ‘flash and blur’ use a combination of electronic flash and ambient exposure. Multiple exposures are sometimes used as an artistic visual effect or to create ghostly images (it is frequently used in photographic hoaxes).

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