Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000723
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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718 COLOR SENSITOMETRY The density values used for such comparisons must correspond to the action of the sound track image in the sound reproducer. An integral density measured in a narrow region of the visible spectrum may be a completely misleading indication of image performance in a sound system using customary photocells with cesium oxide or S-l surfaces. The maximum sensitivity of these photocells lies in the infrared region near 800 m/z, where most dye images are quite transparent. A quite different spectral sensitivity with a maximum near 400 m/x is obtained in photocells with S-4 surfaces; such cells have been successfully used27 in experiments with dye sound tracks. In the 16-mm field, lead sulfide cells28 with maximum sensitivities in the range from 1000 to 3000 m/z have recently come into some use. The SMPE Color Committee voted in October, 1949, to ask the color film manufacturers to determine which of these phototubes are best suited for reproducing sound recorded on their particular color products. Meanwhile, the interpretation of sound track sensitometric tests should be based on integral densities that accurately represent the spectral response characteristics of the particular type of sound reproducer with which the film is to be used. This will normally require a densitometer equipped with a photocell of the same type as that used in the reproducer.