Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941)

[ACTIVE]

Negative Exposure Control

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: It would be desirable to have negative exposure control on the basis of an exact science. Toward this end the functioning of the eye as it views a subject and the photographic reproduction of the subject is studied. The brightness of the subject is broken down into its components of reflectance (a constant) and incident illumination (a variable). The eye compensates for changes in the illumination. The “tone” of the object is based on its reflectance. It is this that determines the print density used to portray the object. Between the subject's fixed reflectance and the print's fixed density lies the variable of negative density. A system is proposed whereby given reflectance in the subject is represented by fixed density in the negative. Operation of the system involves negative exposure control by measurement of incident light. Measurement of effective incident illumination is accomplished by a photoelectric meter specifically designed to respond to the three-dimensional characteristics of incident illumination. The system is free from many of the influences which tend to cause undesirable variations and errors in negative exposure. It provides a means of putting negative exposure control on the basis of an exact science.
Publication Date: 1941-04-01
DOI: 10.5594/J12915
Link: https://doi.org/10.5594/J12915
Author(s): Don Norwood

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Don Norwood; Negative Exposure Control, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12915

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Don Norwood; Negative Exposure Control, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12915

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Don Norwood; Negative Exposure Control, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12915

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<span class="citation">Don Norwood; <cite>Negative Exposure Control</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J12915" target="_blank" rel="noopener">https://doi.org/10.5594/J12915</a></span>

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Preview:

Don Norwood; Negative Exposure Control, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941
doi: 10.5594/J12915
url: https://doi.org/10.5594/J12915

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Don Norwood; <cite id="bib-10-5594-j12915">Negative Exposure Control</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 4, April 1941); SMPTE, 1941
<span class="doi">10.5594/J12915</span>
</li>