Flashing (cinematography)
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In cinematography
Cinematography
Cinematography is the making of lighting and camera choices when recording photographic images for cinema. It is closely related to the art of still photography...

, flashing is a method of contrast enhancement that takes advantage of the natural physical properties of film stock to bring out detail in darker areas of the print.

The effect is produced by adding a very small and even level of exposure to the entire image. Since exposure levels increase logarithmically, this tiny level of additional exposure has no practical effect on an image's mid-tones or highlights, while substantially boosting the shadows of the image, thus allowing darker areas of the image not normally exposed to become marginally visible.

It can be applied to the film stock
Film stock
Film stock is photographic film on which filmmaking of motion pictures are shot and reproduced. The equivalent in television production is video tape.-1889–1899:...

 before, during, or after principal photography of the film, although always before the film's processing. When applied before or after shooting, this is generally done by a motion picture film lab. The level of flashing needs to be tested ahead of time and subsequently moderated appropriately against the light levels of the scene, or else it risks having minimal impact if too low or making the shadows "milky" when too high.

On-set flashing solutions include Panavision
Panavision
Panavision is an American motion picture equipment company specializing in cameras and lenses, based in Woodland Hills, California. Formed by Robert Gottschalk as a small partnership to create anamorphic projection lenses during the widescreen boom in the 1950s, Panavision expanded its product...

's Panaflasher, which is mounted in between the camera body and the camera magazine
Camera magazine
A camera magazine is a light-tight chamber or pair of chambers designed to hold and move motion picture film stock before and after it has been exposed in the camera...

 throat, and Arri
Arri
-History:Arri was founded in Munich, Germany as Arnold & Richter Cine Technik in 1917, named after founders August Arnold and Robert Richter. They produce professional motion picture equipment, digital and film cameras and cinematic lighting equipment...

's Varicon, which functions as an illuminated filter and can be viewed directly through the viewfinder for manual setting of the flash level.

Flashing is usually described as a percentage of exposure increase to the film's base fog level. While the flash itself is often a neutral color temperature, the flash exposure could be any color: the color of the flash will be imbued disproportionately into the shadows of the image.
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