multiple exposure
n.An image consisting of several separate exposures recorded in a single photograph.The technique of creating such an image.
Notes
Multiple exposures may be intentional or accidental. If the shutter in a camera is tripped more than once without advancing the film, the different exposures are superimposed. A similar effect can be done on photographic paper in the darkroom, sometimes called multiple printing. Multiple exposures can also be made by leaving the shutter open while a strobe is fired in succession. Multiple exposures are distinguished from combination printing, in which several negatives are used to print separate parts of a larger, unified image.
