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Journal of the Society of Motion Picture and Television Engineers ( Volume: 59, Issue: 5, November 1952)
[ACTIVE]

A Fast-Acting Exposure Control System for Color Motion Picture Printing

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
An illuminating system in a contact-printer for color motion pictures is described. Light from a single lamp is divided into three beams which are independently filtered, controlled in intensity, and projected onto the printer aperture. Intensities of the red, green and blue components of the exposing light are measured continuously and photoelectrically and compared with reference voltages which are the analogs of the desired intensities and which are controlled by a perforated tape according to the predetermined requirements of each scene to be printed. Any errors between measured intensities and desired intensities, i.e., between photocell outputs and reference voltages, are amplified and applied to servomotors which rotate vanes in the respective beams until the correct intensities are established. A response time of the order of 1/50 sec has been achieved, and the intensity of the printing light is substantially independent of lamp current and age. A manual control on each of the reference voltages provides for emulsion-to-emulsion variations in print stock.
Publication Date
1952-11-01
DOI
10.5594/J04956
Link
https://doi.org/10.5594/J04956
Author(s)
John G. Streiffert
Source Data (JSON)

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John G. Streiffert; A Fast-Acting Exposure Control System for Color Motion Picture Printing, Journal of the Society of Motion Picture and Television Engineers ( Volume: 59, Issue: 5, November 1952); SMPTE, 1952. Available at https://doi.org/10.5594/J04956
Snippet:
John G. Streiffert; A Fast-Acting Exposure Control System for Color Motion Picture Printing, Journal of the Society of Motion Picture and Television Engineers ( Volume: 59, Issue: 5, November 1952); SMPTE, 1952. Available at https://doi.org/10.5594/J04956

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John G. Streiffert; A Fast-Acting Exposure Control System for Color Motion Picture Printing, Journal of the Society of Motion Picture and Television Engineers ( Volume: 59, Issue: 5, November 1952); SMPTE, 1952. Available at https://doi.org/10.5594/J04956
Snippet:
<span class="citation">John G. Streiffert; <cite>A Fast-Acting Exposure Control System for Color Motion Picture Printing</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 59, Issue: 5, November 1952); SMPTE, 1952. Available at <a href="https://doi.org/10.5594/J04956" target="_blank" rel="noopener">https://doi.org/10.5594/J04956</a></span>

SMPTE Icon SMPTE's HTML Pub

Preview:
John G. Streiffert; A Fast-Acting Exposure Control System for Color Motion Picture Printing, Journal of the Society of Motion Picture and Television Engineers ( Volume: 59, Issue: 5, November 1952); SMPTE, 1952
doi: 10.5594/J04956
url: https://doi.org/10.5594/J04956
Snippet:
<li>
John G. Streiffert; <cite id="bib-10-5594-j04956">A Fast-Acting Exposure Control System for Color Motion Picture Printing</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 59, Issue: 5, November 1952); SMPTE, 1952
<span class="doi">10.5594/J04956</span>
</li>