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 #:
000211
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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194 LOYD A. JONES AND OTTO SANDVIK [j. s. M. p. E. time of development, type of developer, quality (spectral composition) of the exposing radiation, and several other minor factors. It is impossible, therefore, with our present knowledge at least, to express the resolving power of an emulsion in terms such that one can calculate very closely the depression in volume of a sound record incurred by imperfect resolution. It may prove useful, however, to consider the nature and the effect of some of the above variables. In order to simplify the problem as much as possible, we shall consider each variable separately. Let us consider first the effect of a change in the image density, keeping all other factors as nearly constant as possible. Fig. 7 shows FIG. 7. Resolving power-image density curve for motion picture positive developed 8 minutes in D-16. a typical curve for cine positive, the object contrast being 1000 and the development time 8 minutes in D-16. This curve shows that the resolution increases from zero at a density of zero to a maximum value of 80 at an image density of 1.3. This density we shall call the optimal density. The general character of this curve is similar for any type of emulsion, although in general the lower the inherent contrast of the emulsion, the lower is the optimal density. Keeping the time of development constant and varying the object contrast, if we measure maximum resolving power, that is, resolving power at optimal image density, we obtain the curve B, shown in Fig. 8. The resolution increases exponentially with the log contrast approaching its maximum value asymptotically. It is seen that cine positive