Principles of cinematography : a handbook of motion picture technology (1953)

Page scan 000259 from Principles of cinematography : a handbook of motion picture technology

Record Details:

Title:
Principles of cinematography : a handbook of motion picture technology
Date:
1953
Publisher:
London : Fountain Press
Volume:
Principles of cinematography : a handbook of motion picture technology
Leaf #:
000259
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Date Added:
May 15, 2025
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SOUND FILM PROCESSING 255 control. Naturally, from this point, it is then necessary to hold these densities fixed whilst the gamma values are varied in subsequent experiments and thereby to completely cover the whole range of possible combinations for each variable in the system. \ 0 \s \^ X -. 3 \ 6 /I SUM. PRINT 0 NS1TY 0 5 C 6 O 7 OS 09 Fig. 1 1 5. — A family of intermodulation curves. It will also be seen from the figure that the negative density may rise to 0-50 and the positive density may vary between 0*55 and 0-65 before any great change in the distortion takes place. This observation may be used to criticise the need for such an accurate control system but, as was found with the cross-modulation system, these limits are only discovered after the test has been made and, once established, may be maintained by normal sensitometric control. The negative and positive densities and gamma values given throughout this chapter are only isolated examples of results obtained with particular equipment and, therefore, should not be assumed to apply in every case. The processing equipment, its operation, the particular characteristics of each recording machine and the type of film employed for this work make it necessary for each studio to carry out tests in close co-operation with the laboratory which will ultimately be called upon to process recordings made at that studio.