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Negative Illumination in Projection Printing

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Abstract

Diffusion in the illumination of a negative to be printed by projection affects the image contrast, the print graininess, the delineation of scratches, and the quantity of light available for printing. These four factors are discussed separately and, from the quantitative results obtained, certain general conclusions regarding the required amount of diffusion for a given type of enlarger are drawn.

© 1934 Optical Society of America

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