Film Term:

A dupe is a positive copy of a positive. A dupe can also be a negative copy of a negative. A dupe is a print made in the reversal process. It can sometimes be clearer to call something a dupe, because to simply say “positive print” you could just mean a positive copy of a negative, which would not be a dupe.

Glossary of Film Terms - http://homepage.newschool.edu/~schlemoj/film_courses/glossary_of_film_terms/
reprinted with permission

Dupe (?), n. [F., prob. from Prov. F. dupe, dube; of unknown origin; equiv. to F. huppe hoopoe, a foolish bird, easily caught. Cf. Armor. houp'erik hoopoe, a man easily deceived. Cf. also Gull, Booby.]

One who has been deceived or who is easily deceived; a gull; as, the dupe of a schemer.

 

© Webster 1913.


Dupe, v. t. [imp. & p. p. Duped (?); p. pr. & vb. n. Duping.] [Cf. F. duper, fr. dupe. See Dupe, n.]

To deceive; to trick; to mislead by imposing on one's credulity; to gull; as, dupe one by flattery.

Ne'er have I duped him with base counterfeits. Coleridge.

 

© Webster 1913.

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