Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000715
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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710 COLOR SENSITOMETRY June that the images have the same color. Experience in the interpretation of density difference data must therefore be separately acquired for each density level. It has been suggested that, in the absence of such experience, the relationship between image color and densitometer readings can be determined and catalogued. If this relationship does not shift with normal variations in processing or emulsion composition, it is possible 32 28 26 24 22 1.6 1.4 0.6 0.2 0.0 1 1 •^. N \ \ \ f. \ \ • \ \ \ \ \ \ \ \ \ ^H 5 -1.2 -0.9 -06 -0.3 0 0.3 0.6 0.9 1.2 1. IrOG 10 E (meter candle seconds) Fig. 12. Gray-scale reproduction characteristics of a color process. Luminous densities of approximately gray images are plotted against the logarithms of exposure. For each step, a small vector is shown; its direction is related to the hue, and its length to the saturation of the image. A zero vector would indicate an accurately gray image. to construct tables or graphs by means of which a set of three integral densities may be translated into luminous density and two numbers associated with hue and saturation. These numbers can be represented by a point on an ICI chromaticity diagram,11 and a vector can be drawn to this point from the point which represents zero densities. A small-scale replica of this vector can then be drawn on the luminous density plot (see Fig. 12) ; for each