Agfa motion picture topics (Apr 1937-June 1940)

Record Details:

Title:
Agfa motion picture topics
Date:
Apr 1937-June 1940
Publisher:
Hollywood : C. King Charney, Inc.
Volume:
Agfa motion picture topics (Apr 1937-June 1940)
Leaf #:
000143
Language:
English
Collection:
Hollywood Studio System and Technical Journals
Format:
Periodicals
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 02, 2023
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the occurrence of very broad fluctuations which then produce a result in the decrease of the graininess. The graininess dependence o n density as shown in Fig. 3 is extrapolated for densities less than .1 I indicated by the dashed part of the curve). Although one should expect no graininess in the absence of grains l i.e. for D = 0) experience shows that a considerable iniohomogeneity remains under such conditions. This is partly due to the celluloid base (this effect is almost absent in glass), in the imohomogeneity of the gelatine, and in the fog. Thus, the graininess produced by these three factors can be estimated, depending on the conditions, to be between 15 and 30 so that the effect of base, gelatine, and fog can easily produce 30 per cent to 50 per cent of the graininess of a fine grain emulsion at low densities. One may be induced to conclude from what has been said above that the graininess is an absolute quantity C D Fig. 4a-4d — Microphotographs of two different emulsions of similar densities of large ( a, b above) and small )c.d) graininess seen under large (« and c) and small [b and d) aperture. A and b. and c and d are taken from an identical region of each of two emulsions. The photographs demonstrate the increase of the graininess impression when observed with small aperture and vice versa, due to the scattering of the illuminating light within the emulsion. 21