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

Page scan 000636 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 #:
000636
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, 1941] MEASUREMENT OF PRINTING DENSITY 631 in the above equations would indicate that the spectral selectivity is a function of the amount of the silver deposit and that the color of the image is to be attributed in part at least to light-scattering by the grain groupings rather than to a developer stain. The linear part of the equations may be attributed to the existence of some color, the spectral composition of which is not affected by the amount of the silver deposit. AOU PONT <. 1203 K. + X SUPERIOR] NEG. J-E.K.I NEG. J 301 PRI •JT \ -t-E. \ \ \ \ \ \ \ ^ >-s, .6 .8 1.0 1.2 1.4 NEGATIVE PRINTING DENSITY FIG. 8. True printer H&D curve for various panchromatic picture negatives. Printing Density in Practice. — Since a method has been found for measurement of negative printing density, it would seem highly desirable in laboratory practice to substitute this technic for the present practice of making visual measurements of photographic negatives. While the latter may be used satisfactorily for control of the developing solutions, the values of density and gamma obtained from visual measurements are not all representative of the actual density or gamma of the negative that is effective in the printing process. This is well illustrated in Fig. 10, where visual and printing H&D curves are plotted from the same sensitometer strip on the fine-grain 222 emulsion. In this case the visual gamma of 0.49 actually becomes 0.61 in the printing process. The latter value must therefore