Method of determining the optimum exposure conditions for a colo

Details Method of determining the optimum exposure conditions for a colo Method of determining the optimum exposure conditions for a colo

1984-03-16

1986-09-16

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Photography

355 38, 364526, G01J 351, G03B 2780

Patent

active

046119183

ABSTRACT:
A new method of making it possible to quickly and easily determine the optimum exposure conditions for a photographic color printer is disclosed. The method is performed by way of the steps of preparing a plurality of test prints under different exposure condition using a standard negative film, measuring optical density for each of color components on the test prints, comparing their optical density with that of corresponding color component on a standard print, detecting change in optical density per unit positional change of correction key on each of the test prints with respect to each of color components, and determining corrective value required for correcting density difference between each of test prints and standard print with reference to the above change in optical density per unit positional change of correction key. The color printer includes four lines of exposure correction keys comprising density keys, yellow keys, magenta keys and cyan keys and an exposure condition for test prints is determined such that one of exposure condition correction keys selected from the four lines is a correction key ranked above or below normal keys and all other keys are normal keys.

REFERENCES:
patent: 2949812 (1960-08-01), Lanco
patent: 3963344 (1976-06-01), Hujer et al.
patent: 4309496 (1982-01-01), Miller

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