Transactions of the Society of Motion Picture Engineers (1916)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1916
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Society of Motion Picture Engineers : incorporation and by-laws (1916)
Leaf #:
00088
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:
December 28, 2023
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When the projecting machine is horizontally in line with the center of the screen but a considerable distance to one side or the other of it, then the same distortions are present in the picture, but with some difference, as follows : 1. The sides of the picture will be blurred while the middle will be clear. 2. A body moving from one side to the other of the picture will become larger or smaller. 3. All horizontal objects will be larger at one end than at the other. 4. All objects will be abnormally long. In some theatres the projecting machine is offset both horizontally and vertically, in which case the picture shows evidence of both kinds of distortion described in the special case above. There have been certain attempts made to correct the bad effects of "offset projection" but, owing to the fact that offset projection is basically wrong, these methods have proved far from successful. These corrective methods consist in: 1. Filing the aperture plate of the projecting machine, and thus giving the light cone a distorted shape previous to its reaching the screen — the result of this distortion and the natural distortion being neutral and thus having a picture with a correct border line. But, it should be noted that this method does not in any way correct the distortion actually within the border. 2. Showing a small picture high upon the screen. The disadvantage of this method is apparent. 3. Tipping the screen one way or the other. This method makes the picture hard on the eyes of the audience and is, consequently, little used. In conclusion it may be stated that there is at the present time only one way of preventing the ill effects of "offset projection" and that is to eliminate the "offset," in other words, to place the projecting machine nearly opposite the center of the screen.