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

Page scan 000637 from Journal of the Society of Motion Picture Engineers

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 #:
000637
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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632 J. G. FRAYNE [J. S. M. P. E. be considered the true gamma of the negative since it is the value which is the determining factor in the overall contrast of any print made from this negative. Similarly if the sound-track density on this particular film is considered to be 0.65 on a visual basis, the true density as seen by the positive emulsion is actually 0.78. It will also be observed that the shoulder is less abrupt on the printing density H&D curve which makes the characteristic more favorable for variable-density recording than would appear from an inspection _ 1 r_ i-DU PONT 215 NEG. 2-E.K. 1301 NEG. 3-DU PONT 222 NEG. 4-E.K. 1203 NEG. 0 .2 .4 .« .8 1.0 1.2 1.4 VISUAL DENSITY FIG. 9. Relation of printing to visual density for various photographic negatives. of the visual H&D curve. These observations lead to the obvious conclusion that the substitution of printing for visual densities makes possible a more accurate interpretation of the true photographic qualities of the negative. From the practical laboratory standpoint, the substitution of printing for visual density control eliminates some of the most confusing elements in the processing operation. At the present time it is necessary to establish printer factors for each type of negative in order to permit accurate setting 'of the printer exposure for the particular negative being printed. Since we have seen that the color coefficient