Colored object which exhibits improved constancy of color appear

Details Colored object which exhibits improved constancy of color appear Colored object which exhibits improved constancy of color appear

1987-11-23

1989-04-25

Evans, F. L.

Optics: measuring and testing

Standard

G01J 102

Patent

active

048242462

ABSTRACT:
Colored object which is to be illuminated by many different types of sources of illumination and which exhibits an improved constancy of color appearance upon change of illuminants. The radiation-absorbing exterior portion of the object has color-absorbing components which combine to exhibit reflectance bands peaking at about 450 nm in the blue-violet, about 530 nm in the green and about 610 nm in the orange-red. The reflectance bands are substantially confined to a radiation range of 50 nm to 60 nm as measured at one-half of the maximum measured reflectance of the bands. This range can be expanded to 40 nm to 80 nm with some sacrifice in performance. The relative proportions of each of the color-absorbing components are preselected to produce a desired composite color for the exterior portion of the object. There is also provided a method for making the exterior portion of the object.

REFERENCES:
patent: 3877797 (1975-04-01), Thornton, Jr.
Brill et al, "Chromatic Adaptation and Color Constancy: A Possible Dichotomy", Color Research and Application, vol. 11, No. 3, Fall 1986, pp. 196-204.
J. Illum. Eng. Soc., 6, pp. 92-99 (1977) "The Design of Safety Colors", W. A. Thornton.
Color Res. & Appl., 10, pp. 73-83 (1985) "Methods for Generating Spectral Reflectance Functions Leading to Color-Constant Properties", Roy S. Berns, Fred W. Billmeyer, Jr., and Richard S. Sacher.

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