Cinematographic annual : 1930 (1930)

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000132
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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114 CINEMATOGRAPHIC ANNUAL Step Number Rel, itive Exposure Log. Relative Exposure 1 1 0.00 2 2 0.30 3 4 0.60 4 8 0.90 5 16 1.20 6 32 1.50 7 64 1.80 8 128 2.10 9 256 2.40 Lo.. ^ these values of log exposure the densities of the various deposits are plotted and the curve obtained. This curve is divided into three major sections as marked off in Figure III. The first section is the region of under exposure and shows a gradually increasing slope. U • / / M ]/^ IB fclS g 1.2 Q0S H / Oft I 13 0.0 03 0.0 03 It I.S 1.0 U M t7 3.0 33 3.C LOG EXPOSURE Fig. 3 The second section is the region of correct exposure and shows a straight line characteristic indicating the density is increasing proportionately with increased exposure. The third section is the region of over exposure and shows a curvature of gradually decreasing slope. From curves of this type Hurter and Driffield propounded certain definite constants, such constants as speed, latitude, development factor (gamma) were determined. Speed was defined as the inverse of the inertia times a constant factor of 34. For example, if the inertia was considered as 0.54 the