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 #:
000633
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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630 BLOUNT December may be directed precisely toward the desired area and may be readily adjusted in relation to the level of general illumination. Further to improve the received picture, individual colors should be reproduced in shades of gray having the relative brightness values of the original colors. This is possible only when the spectral sensitivity of the camera tube combined with the spectral energy radiated by the light source results in a response or photoeffectiveness that approximates the luminosity curve of the eye.2 Jp= J WAVELENGTHANGSTROMS Fig. 8 — Photoeffectiveness of 5820 image orthicon 4500 white fluorescent lamp. Fig. 1 shows the photoeffectiveness curve of the 5769 image orthicon when used with a typical tungsten-filament lamp operating3 at 3000 degrees Kelvin. For comparison the eye-response curve is shown. Note that the shape of the image-orthicon photoeffectiveness curve differs from the eye curve; distortion occurs in the picture because of excessive response in the long wavelength red and the ultraviolet regions. Fortunately, such distortion can be eliminated easily by the use of a color-correcting filter at the camera lens. Filters4 such as the Wratten No. 7 and the Corning No. 9788 on the camera lens provide the needed correction (see Fig. 2), with, of course, some resultant loss in signal. In Table I comparative output-signal levels are listed in