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Feb., 1930]
CHARACTERISTICS OF SOUND FILM
193
TABLE V Sensitometric Data for Motion Picture Positive. Developed in D-16
Td
7
Log Ei. 5
Fog
R.P.
2.5
1.02
1.18
0.04
74
5.0
1.81
0.40
0.05
73
8.0
2.28
0.07
0.06
71
12.0
2.48
1.93
0.07
71
6.0
2.00
0.22
0.05
72
siderable promise, but further experimental work must be done before definite conclusions as to its utility and practical value can be drawn. As stated previously, the photographic process is concerned with two factors, namely, the rendering of tone and the reproduction of form. The former depends on the sensitometric characteristics of the emulsion, whereas the latter depends primarily on its resolving power and sharpness. This distinction is only partial, however, because those factors obviously affect the tone values; furthermore the properties of an emulsion which determine its sensitometric character
TABUS VI
Sensitometric Data for an Experimental Emulsion. Developed in D-16
Td
7
Log EJ.&
Fog
R.P.
2.0
3.6
0.10
0.02
120
4.0
4.0
0.00
0.02
117
6.0
4.7
1.80
0.02
114
8.0
5.7
1.70
0.03
112
12.0
6.0
1.50
0.03
98
4.0
4.0
0.00
0.02
117
istics also determine largely its resolution and sharpness. The nature of the problem should necessarily determine the type of emulsion to be used. Thus in the case of sound recording, where high frequencies consist of photographic images very close together, it is necessary to use an emulsion which has high resolution ; yet it must be sufficiently sensitive to attain the required density with the exposure available. Unfortunately, these two factors bear in general a reciprocal relation. The resolving power of an emulsion is an extremely complex problem depending on a number of variables such as distribution of intensity and contrast in the object, density of the photographic image,