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Film Technology in Post Production, 2nd Edition by Dominic Case

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The original image must be duplicated for many reasons.

Laboratory Processes

Duplication

Reasons for duplication

image   A final cut negative represents the entire production investment of a film. Preparation of an interpositive provides a printing quality backup copy of the film in case of damage to the original, while printing from a duplicate negative protects the original from wear and tear.

image   Prints are often required in different formats, so that a blow-up or reduction negative must be made.

   Bulk release printing requires that scene-to-scene ...

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