International Review of Educational Cinematography (Jul-Dec 1929)

Page scan 000427 from International Review of Educational Cinematography

Record Details:

Title:
International Review of Educational Cinematography
Date:
Jul-Dec 1929
Publisher:
International Educational Cinematographic Institute
Volume:
International Review of Educational Cinematography (Jul-Dec 1929)
Leaf #:
000427
Language:
English
Collection:
Non-Theatrical Film
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:
Date Added:
September 12, 2024
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opaque screens will form at these points and intercept the projection of the colour. Thus a black image is obtained which, upon being projected through the tri-colour screens, produces a negative image, the colours of which are complementary to those of the object. There are many difficulties in the way of the use of these negatives for printing the positives ; these depend partly on the fact that the « craped » surface of the film on which the copies are printed requires a slightly different focus to that of the negative film. A correct positive is obtained, moreover, only by the direct inversion of the negative. Thus the process can be used only where a single copy is required, as in the case of amateur films. For this reason the Keller-Dorian Berthon process has so far only been used for such purposes, great perfection being attained in this line by the Kodak Pathe Company in its Kodak Colour Film. But the research which is now being actively pursued with a view to perfecting this process justifies the hope that it may lend itself to a wider industrial application in the more or less near future. A. Seyewetz. Professor at the Institute of Industrial Chemistry of the Lyons University. 411 —