Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Physical developing
Patent
1994-08-11
1996-08-06
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Physical developing
430 30, 430494, 2502521, 356443, 356444, 359 20, G03B 4100, G03C 500, G03C 504, G01N 2100
Patent
active
055438830
ABSTRACT:
Sensitometers are used for monitoring photographic and radiographic processes, and then making it possible to control these processes. However, although it is relatively straightforward to obtain control strips for individual sensitometers, it is often difficult to compare the results of control strips which have been exposed using different sensitometers. Described herein is a method for calibrating or cross-referencing sensitometers. The method comprises exposing a first control strip to a step wedge in the first sensitometer, and a second control strip-to a step wedge in the second sensitometer, the first and second control strips being formed on the same photographic material. The material is then processed and the characteristics of the material is determined using the known exposures given to the material by the second sensitometer and the density values obtained corresponding to those exposures. Once these characteristics are known, it is then possible to calculate the exposure given at each-step on the first control strip using the following equation:
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J. B. Ross, "An Automated Densitometer System for Measurement of Spectral Sensitivity", J. Appl. Photog. Engineering, vol. 3, No. 4, Fall 1977, pp. 194-198.
Hurter and Driffield, The Journal of the Society of Chemical Industry, No. 5, vol. 9, May 31, 1890.
Bowers Jr. Charles L.
Eastman Kodak Company
Pasterczyk J.
Rosenstein Arthur H.
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