Practical cinematography and its applications (1913)

Record Details:

Title:
Practical cinematography and its applications
Date:
1913
Publisher:
Philadelphia, Lippincott
Volume:
Practical cinematography and its applications
Leaf #:
000118
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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PRINTING THE POSITIVE 81 can only be acquired in the school of practice. The same experience is needed to estimate the length of the exposure in making lantern slides, or in bromide printing. But it must be borne in mind that in the cinematograph film one is working with a much more sensitive emulsion. A very good practice for the beginner is to make experimental exposures with short lengths of film — say 12 inches—making the tests with sections of the negative which vary in density, at various distances from the light, and at different speeds. A careful note should be made of each trial. In this way one can estimate the exposure and learn how it should be varied at different points of the negative where the density varies. Moreover, the knowledge will be acquired at comparatively little expense. If the negative has been over-exposed or over- developed, or both, a common error in the first attempts, it will naturally be very dense, and will demand a longer exposure, or a more powerful light, than a negative which is exposed correctly. This situation may be met either by slowing down the process of printing, or by bringing the light nearer to the film. On the other hand, if a negative is under-exposed it had better be destroyed at once, as it is worse than useless. An over-exposed negative will yield a passable print, possibly somewhat harsh, but nothing can P.C. G