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hernesheir commented on the word a and b rolls
(n): The negative of an edited film, cut to correspond to picture, built into 2 rolls, A and B, to allow for invisible splices, instant changes of the timing lights and fades and dissolves without the need for opticals. The A roll has the odd numbered shots, with black leader in place of all the missing shots. The B roll has the even numbered shots, with black leader in place of all the shots on the A roll. The negative is printed in three passes through the contact printer, one for each roll and another for the soundtrack. Only after all the elements have been exposed onto the print stock is the print developed, resulting in the A&B print.
January 17, 2009