Society of Motion Picture Engineers : incorporation and by-laws (1927)

Page scan 000191 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1927
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1927)
Leaf #:
000191
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
September 12, 2024
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Light Filters — Jones ■ 181 that the color index of that particular area is entirely different than at the point where this multiple reflection does not occur. It would be impossible, therefore, to state that this particular fabric has any definite correlative gray value. As I said before it is perfectly possible theoretically to replace any color whatsoever with the corresponding gray, but when w^e consider the many complications it may be quite prohibitive from the practical standpoint. The establishment of the correlative gray for any particular color I think can be done by a method somewhat more simple and direct than the method suggested by Mr. Ross. Measurements of visual brightness made by the flicker photometer are perfectly reliable and quite independent of the normalcy of the color vision in the observer. To match this it is only necessary to make up a gray paint of the same reflecting power. Of course when I say gray I mean a color which is both visually and photographically non-selective. I am incHned to believe that the failure to produce a satisfactory result by the use of multiple grays as cited by Mr. Stewart is due to one or more of the rather obscure factors, among which may be mentioned the change of hue and saturation due to multiple reflections, the change in composition of the light as conditioned by reflection from and penetration into the shadows, and possible also to the Purkinj e effect .