Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 6, December 1937)

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Standardization of Photographic Densitometry

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: It is desirable that all laboratories dealing with photographic problems shall be in agreement upon the significance of the term “density,” and that the means for numerically determining this value shall be specifiable. In different optical systems, the apparent “light-stopping power” of a given photographic image will vary because of the manner in which that sample reflects, scatters, and absorbs light. Since the numerical value obtained depends upon the characteristics of the optical system used in the densitometer, it becomes necessary to specify the optical system to be used as a reference standard. Because it may be definitely specified, the integrating sphere is suggested as the light-collector for this standard optical system. Precautions that must be followed in using the sphere are enumerated. It is shown that once some standard optical system is adopted, several other types of optical systems may be employed in practical instruments if the instruments are calibrated under actual working conditions with photographic images previously measured in the system adopted as standard. The paper concludes with a discussion of the interrelationships of log10 apparent opacity as determined in several optical systems commonly used in densitometry.
Publication Date: 1937-12-01
DOI: 10.5594/J01910
Link: https://doi.org/10.5594/J01910
Author(s): Clifton Tuttle, A. M. Koerner

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Clifton Tuttle and A. M. Koerner; Standardization of Photographic Densitometry, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 6, December 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J01910

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Clifton Tuttle and A. M. Koerner; Standardization of Photographic Densitometry, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 6, December 1937); SMPTE, 1937. Available at https://doi.org/10.5594/J01910

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<span class="citation">Clifton Tuttle and A. M. Koerner; <cite>Standardization of Photographic Densitometry</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 6, December 1937); SMPTE, 1937. Available at <a href="https://doi.org/10.5594/J01910" target="_blank" rel="noopener">https://doi.org/10.5594/J01910</a></span>

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<li>
Clifton Tuttle and A. M. Koerner; <cite id="bib-10-5594-j01910">Standardization of Photographic Densitometry</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 29, Issue: 6, December 1937); SMPTE, 1937
<span class="doi">10.5594/J01910</span>
</li>