The history of three-color photography (1925)

Record Details:

Title:
The history of three-color photography
Date:
1925
Publisher:
Boston : American Photographic Publishing Company
Volume:
The history of three-color photography
Leaf #:
000561
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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Printing from Screen Plates 545 mm., and assuming that the light is 400 mm. distant, then the size of the latter will be given by the equation : 1 m v 3>< 400 *n 1 = 0.1 X o = 60 mm. It will be obvious that this process of enlarging the color units also affects the outlines of the objects in the picture. The point c in Fig. 139 thus appears as the line s, and the extent to which it is thus spread out Fig. 143 (Page 546). characterizes the degree of unsharpness in the copy. The figure shows that L s — j — — , and thus the want of sharpness j equals 60 X 2/400 = 0.3 mm. In the case of the Autochrome c may be taken as 0.025, having regard to the fact that the film contains clumps of grains of the same color, although the diameter of each starch grain is 0.012 mm. If the glass side of the original lies upon the sensitive film, then a is 2 mm., and if the lightsource be placed 500 mm. distant, then the size of the light-source L is given by the equation : , nn9, 3X500 L = 0.025 ^ = 18 mm. and the unsharpness s = 12 500 =-0.06 mm. 5o