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B-roll
B-roll (B roll, or Broll) has several meanings in the film and television production industries. It may refer to the supplemental or alternative footage intercut with the main shot in an interview or documentary; in fiction film, it is a technique used to indicate simultaneous action or flashbacks; and commercially may refer to privately shot footage provided free of charge to broadcast news organizations as a means of gaining free publicity. Such B-roll film sometimes makes its way into stock footage libraries.
==Etymology==
The term ''B-roll'' originates from the method of 16 mm film production from an original camera negative. Frames of workprint and of original negative are matched exactly through the use of edge numbers that appeared on each frame of original and work print. But the original was not strung together in a simple linear fashion as was the work print. Instead, the original was edited in a "checkerboard" pattern, with each shot synchronized to an equal length of opaque leader on a second or "B" roll.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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