The Halftone effect in color photographic enlargements

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Title: The Halftone effect in color photographic enlargements
Author: Crowsey, Rick
Abstract: In continuous-tone photography, a 'Halftone Effect" sometimes occurs that alters the tone reproduction in a distinctive way. Highlight contrast is decreased and middletone densities are lowered. Published data show that this effect occurs in black-and-white photography when the grain pattern of the negative is reproduced very sharply in the print . High-magnification enlargements are especially susceptible. Does a corresponding effect occur in color photography? A search of the literature reveals no answer. The research here described is to determine, by direct measurements of densities in sharp and blurred enlargements, the magnitude of the halftone effect in particular color enlargements from color negatives. The validity of the procedure and the adequacy for the enlarger was tested by using black-and-white enlargements that demonstrate the halftone effect. The magnitude of the halftone effect was measured for color prints produced at a magnification of 25X. Grainless prints for comparison were obtained by rotating the print material during the exposure. The experimental results showed that the expected changes in density and contrast do not occur in the color materials studied.
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Date: 1981-05

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