Double Exposure refers to the technique of imposing two images into a singe space, either by taking two pictures on a single frame of film or printing two different images onto the same piece of photo paper. While a photographer will use a double exposure for artistic effect, if a double exposure occurs accidentally, it can potentially ruin a given shot.
Unfortunately, the later form of double exposure renders a blurry, undefined picture. Yet, when done correctly, double exposure appears on a photograph as if one image has been superimposed over another.
One way to create a double exposure as you are taking a picture is to use afilter: cover part of the lens and take a snapshot; then remove the cover, place it over the other part of the lens and take another shot. At times, more than two images are exposed to a singe frame of film. In these cases, the photographer has effected a “multiple exposure.”
Ideally, double exposure shots are best done with the camera set on a tripod in low to medium lighting.
Some cameras have a “double exposure” option as part of their features; most often, these are manual, rather than digital. However, modern computer software, such as Photoshop, allows a photographer to replicate the effect of a double exposure.
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