Cover: A Photographic Technique for Image Enhancement: Pseudocolor Two-Separation Process.

A Photographic Technique for Image Enhancement: Pseudocolor Two-Separation Process.

Published 1971

by R. H. Stratton, Carl Gazley

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A method for transforming each tone of gray in a black-and-white image into a different color, enabling viewers to extract more information. Using only two intermediate separations, red and blue, the process is even simpler and faster than the red/green/ blue process reported in RAND/R-0596. It also gives a more evenly spaced range of hues. However, with the improvements described in this report, the three-separation technique has the greater flexibility. In the two-separation process: (1) One separation is made from the original positive and developed. (2) Another is contact-printed from the first--not emulsion-to-emulsion--and developed. (3) The first is contact-printed, emulsion-to-emulsion, on color film, using a red light source. (4) With careful image registration, the second is contact-printed, emulsion-to-emulsion, on the same material under a blue light. (5) The print is processed. Examples are included.

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