proportional reducer

proportional reducer

[prə′pȯr·shən·əl ri′dü·sər]
(graphic arts)
A solution that is used to lower density in a negative or positive image in proportion to the silver present, with a certain amount of loss in shadow detail.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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