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Matching Densitometry to Production
By HOWARD T. RAFFETY
Densitometry at Cinecolor matches use as closely as possible. To this end, densitometry of material to be used on optical printers is on a "specular densitometer," and densitometry of sound tracks is on a "sound reproducer densitometer." This paper describes these two densitometer s.
J. HE "Callier Q" factor of silver images on film is a very indeterminate quantity. Because it changes with the type of film, development conditions, density and gamma, it is impossible to calculate a factor that can be applied to diffuse densitometry and have it match any particular specular use.
Ginecolor has taken the attitude that in order to have densitometry represent as completely as possible the actual filmprinting operation, the "Q" factor must be by-passed entirely, and densitometry set up on the basis that the density reading match as closely as possible the density which the raw stock will see during printing.
Specular Densitometer
The specular densitometer in use at Cinecolor is a Welch Densichron Transmission Densitometer converted to read
Presented on April 30, 1953, at the Society's Convention at Los Angeles by Howard T. Raffety, Cinecolor Corp., 2800 W. Olive Ave., Burbank, Calif. (This paper was received on April 6, 1953.)
specular densities. In the original Welch densitometer the design of the lightcollecting device which feeds the photosensitive surface is such that all light entering the collector falls onto the phototube, thus reading diffuse density. This densitometer consists of two units: the Welch Densichron Transmission Density Unit #2150D and the Densichron #2150 (see Fig. 1).
The Cinecolor modified model consists of these same two units with the addition of a film-handling gate. The light-collecting attachment was changed (see Fig. 2). The plastic integrating bar was removed and a collimating device was inserted in its place. This collimator consists of two plates about 1 in. apart with the faces parallel and with ^-in. holes drilled in them. The collector was mounted about an inch away from the track where the film sample is placed to be densitometered. The densities obtained in this way are a close approximation of specular densities as seen by an Acme optical printer. This modification of the light-collecting attach
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June 1953 Journal of the SMPTE Vol. 60