Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000656
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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June, 1930] VARIABLE AREA SOUND FILMS 639 Suppose we have a negative in which the exposed half of the track has a density of 1.2 while the rest of the film is fogged to a density of 0.08. The transmissions corresponding to these densities are 6.3 per cent and 83 per cent, respectively. A film exposed under this negative will receive 83/6.3 or 13.2 times as much light on one side of the track as on the other. The logarithm of this ratio is 1.12. If the printer exposure is adjusted so as to give a density of 1.3 on the dark side of the print sound track we see from Fig. 3 that the logarithm Z o 1.8 /.f U.6 Q .f .2 0 f / 1 / 1 / / / I 1 / 1 / / / -^ X ^* ^ $00 9.20 ?.+0 ?.60 9.80 0.00 0.20 0.40 LOGflRtTHM OF EXPOSURE (c.M,S.) FIG. 3. H & D curve for positive film developed to 7 = 2.0. of the exposure is 0.25. The logarithm of the exposure on the protected side is 0.25 minus 1.12, or 9.13-10, which, as we see by Fig. 3, corresponds to a density of 0.08. Consulting Fig. 2 we find that a print having a track density of 1.3 with a density of 0.08 on the clear side will have a sound output of 95 per cent minus 17 per cent, or 78 per cent. By a repetition of this process it is easy to obtain curves showing the behavior to be expected of prints made from any type of negative.