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.
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Multiple exposure in the context of Exposure (photography)
In photography, exposure is the amount of light per unit area reaching a frame of photographic film or the surface of an electronic image sensor. It is determined by exposure time, lens f-number, and scene luminance. Exposure is measured in units of lux-seconds (symbol lx⋅s), and can be computed from exposure value (EV) and scene luminance in a specified region.
An "exposure" is a single shutter cycle. For example, a long exposure refers to a single, long shutter cycle to gather enough dim light, whereas a multiple exposure involves a series of shutter cycles, effectively layering a series of photographs in one image. The accumulated photometric exposure (Hv) is the same so long as the total exposure time is the same.
Multiple exposure in the context of Georges Méliès
Marie-Georges-Jean Méliès (/meɪlˈjɛs/ mayl-YES, French: [maʁi ʒɔʁʒ ʒɑ̃ meljɛs]; 8 December 1861 – 21 January 1938) was a French filmmaker, actor, magician, and toymaker. He led many technical and narrative developments in the early days of cinema, primarily in the fantasy and science fiction genres. Méliès rose to prominence creating "trick films" and became well known for his innovative use of special effects, popularizing such techniques as substitution splices, multiple exposures, time-lapse photography, dissolves, and hand-painted colour. He was also one of the first filmmakers to use storyboards in his work. His most important films include A Trip to the Moon (1902) and The Impossible Voyage (1904).