![]() ![]() It is considered easiest to have a manual winding camera for double exposures. It also is sometimes used as an artistic visual effect, especially when filming singers or musicians. It is frequently used in photographic hoaxes. The technique can be used to create ghostly images or to add people and objects to a scene that were not originally there. The resulting photographic image shows the second image superimposed over the first. In film and photography, double exposure is a technique in which a piece of film is exposed twice, to two different images. For example, a sensitivity window comprising a Dirac comb combined with a rectangular pulse, is considered a multiple exposure, even though the sensitivity never goes to zero during the exposure. This effect can be approximated by a Dirac delta measure (flash) and a constant finite rectangular window, in combination. ![]() ![]() Some single exposures, such as "flash and blur" use a combination of electronic flash and ambient exposure. ![]() two partial exposures are made and then combined into one complete exposure. The simplest example of a multiple exposure is a double exposure without flash, i.e. The criterion for determining that something is a double exposure is that the sensitivity goes up and then back down. 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. Ordinarily, cameras have a sensitivity to light that is a function of time. 2.3 Examples in art, movies and television. ![]()
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