Method of determining color tone of glitter-containing coating

Details Method of determining color tone of glitter-containing coating Method of determining color tone of glitter-containing coating

1995-09-19

1996-12-10

Evans, F. L.

Optics: measuring and testing

By shade or color

Tristimulus examination

356425, 364526, G01J 350

Patent

active

055836429

ABSTRACT:
Light reflected from a sample coating is measured in three directions that are angularly spaced by angles of about 15.degree., about 45.degree., and about 75.degree. or about 110.degree. from the direction of regular reflection of illuminating light toward the direction in which the illuminating light is applied. Color differences are then determined from the measured lights and known values of reference color tones, and one of the reference color tones whose color difference is minimum is determined. Flop values of the sample coating with respect to lightness, saturation, and hue are determined from the measured lights, and the color tone of the sample coating is determined based on color differences between the determined flop values and flop values that are characteristics of the reference color tones.

REFERENCES:
patent: 3916168 (1975-10-01), McCarty et al.
patent: 4479718 (1984-10-01), Alman
patent: 4572672 (1986-02-01), Orchard et al.
patent: 4692481 (1987-09-01), Kelly
patent: 4711580 (1987-12-01), Venable
patent: 4813000 (1989-03-01), Wyman et al.

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