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which is the tangent of the angle formed by the straight-line portion of the characteristic curve and the log exposure axis, is an indication of the degree of development only, and must not be confused with contrast, which depends upon factors connected with balance of exposures in the camera as well as the degree of development.
Picture Negative Development
There are two methods in use by laboratories for the development of picture negative film. Most generally used is the test method, in which test strips are taken from
obtained by developing at frequent intervals negative film sensitometric strips.
The other method, used in both England and the U.S.A. by large laboratories usually attached to a particular studio, is to develop all studio takes to a constant gamma value of 0.65—0.70, no test strips being taken from the exposed picture negative rolls. Actually, of course, the two methods do not vary greatly in results, because modifications in development time to compensate for overor under-exposure can only be carried out successfully between relatively narrow limits. When, for instance, a negative take which has
the end of each roll of exposed picture negative sent in for development, and these strips are developed to the normal gamma value, which in most laboratories appears, to be from 0.65 to 0.70. The developed test strips are then examined by the man in charge of the department, who determines by personal judgment the development time required by the particular roll from which a test piece was taken. The action of the developer itself is maintained constant by varying either the replenisher rate or tthe machine speed, according to the results
HTC: 4
been badly under-exposed originally and over-developed to ‘‘ save it’? is cut in with normal exposures on either side of it, the print, which is developed ito a standard gamma value, when projected will inevitably show a loss in quality on that particular scene.
Sound Track Negative Development
Turning now to the development of negative sound track, it will be unnecessary to give more than a rough outline of the methods used, since it is customary for