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COLOR RENDITION 267
ferent color-squares would be uniform, and the tests therefore accurate.
Then came the problem of the manner of photographing these tests. Obviously, it would have been considerably easier to have photographed them with the conventional 8x10 still camera; but this would have been no true test, for, contrary to the general opinion, the writer found that the emulsions coated on photographic and cinematographic films by the various manufacturers are entirely different in many characteristics. Furthermore, this would have given no measurement to the grain of the several cinematographic emulsions— a feature which is also of great importance to the cinematographer. Therefore, these tests were made on standard motion picture negative film, in a standard motion picture camera; in order that the exposures might be absolutely even, a motor was used, and a definitely fixed footage — fifteen feet — was exposed in each case. A total of about 10,000 feet of film was exposed in the course of these tests.
The negative exposed was treated in the identical manner in which it would have been treated if it had been a part of ordinary, commercial production. It was developed in a well-known commercial laboratory, by machine methods, and in the solutions regularly employed by that laboratory. In fact every step in the making of these tests was as close to normal production conditions as was humanly possible.
A single frame of each test strip was chosen at random and enlarged to 8x10 inches, being printed on glossy stock, and, as said before, to a uniform relative density. These prints were then mounted on a muslin backing, and fitted with a hinge, and the tests of each make of film collected in a separate, loose-leaf album, as were the original color-charts. It is well to note that the record of each film, light and filter was photographed with each color sheet making a single, permanent record. Together, these five books comprise as complete a set of reference-charts as the author has thus far been privileged to inspect, and it is with what he hopes is pardonable pride that he presents them to the cinematographic profession.
The color-chart sheets which were photographed in this test number nineteen; each sheet contains squares of nine different shades or colors, making a total of one hundred and seventy-one different colors and shades tested; these have been photographed on each of the four makes of film most used in America production, viz., Eastman Type Two Panchromatic, DuPont Panchromatic, Agfa Panchromatic, and Agfa Super-Speed (Orthochromatic) . Nine different light and filter conditions were used on each test. It is well to mention here that the same lens, a four-inch Pan Astro was used in all these tests and at its full opening of f: 2.3. The shutter, of course, was manipulated to compensate the variations of light and filters used.
The colors on the test charts are arranged as follows, nine different shades being grouped on each sheet;