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Thirty
The INTERNATIONAL PHOTOGRAPHER
August, 1929
Illustrating ^Multicolor
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.HE present multicolor process is a subtractive two-color method of color photography. All methods of color photography are divided into two classifications and two only, namely, "additive and subtractive. In additive processes the colors on the screen are obtained by the addition of a varied colored revolving disc. In subtractive processes the colors are visible on the film itself and require no additional means for projection. The multicolor process comes under the second classification. The camera used for recording the multicolor negatives is a standard Bell Howell or Mitchell. The only added requirement to a standard camera is a special multicolor magazine which accommodates the multicolor negatives. Two negatives run through the camera at the same time with their emulsion surfaces adjacent to each other.
Referring to Illustration No. 1, the method of obtaining color value negatives by the multicolor process is illustrated as follows: "A"-"B" represents the front of the two negatives, and "C" the second negative. "A" is a negative which is sensitive
BY
T. CRESPINELL, Technical Advisor for Multicolo FIG. 1
A B C
LENS
to the green-blue end of the spectrum. "C" is a Panchromatic negative, that is, a negative that is sensitive to the whole range of the spectrum. Incorporated in emulsion "A" is a dye which penetrates only a small part of the thickness of the emulsion and is represented as "B". The color of this dye is orange-red and is equivalent in its photographic use to a Wratten filter No. 23A.
Referring to Illustration No. 2 B-C, the chart shows how various color values are recorded onto these two respective negatives. The front film records the colors of the green-blue
A. Represents the colored object to be photographed.
B. Represents the multicolor or front negative and the color values recorded thereon.
C. Represents the second or back negative and the color values recorded thereon.
D. Represents one side of a strip of doublecoated positive film with a print from negative B. This positive is colored red.
E. Represents the opposite side of the positive
with a print from negative C. This positive is colored blue.
pnd of the spectrum, and the filter incorporated in the emulsion of the
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Climax Incandescent Studio Lighting Equipment
SALE AND RENTAL
Everything Mechanical and Electrical for the Studio
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HARRY D. BROWN 1438 Beech wood Drive Phone HO. 0513 Hollywood, California
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