Method and apparatus for measuring and controlling the color of

Details Method and apparatus for measuring and controlling the color of Method and apparatus for measuring and controlling the color of

1981-03-03

1984-03-27

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

With sequential comparison of sample and standard

356419, 364526, G01N 2127

Patent

active

044390386

ABSTRACT:
Apparatus for measuring and controlling the color of a moving web in which a circular variable bandpass filter having a passband varying substantially continuously with angular displacement through the optical spectrum is interposed in the optical path between the web and a detector and is rotated to produce a detector output which periodically scans the optical spectrum. In one disclosed embodiment, the detector outputs at the various wavelengths are weighted to produce X, Y and Z tristimulus values while, in another disclosed embodiment, dye flows are so controlled as to minimize the total square error between the measured reflectance spectrum and the desired reflectance spectrum.

REFERENCES:
patent: 3936189 (1976-02-01), De Remigis
patent: 4019819 (1977-04-01), Lodzinski
patent: 4029419 (1977-06-01), Schumann, Jr. et al.
James et al., Mathematics Dictionary, p. 253, Feb. 1966.
Cutler, "A New Colour-Matching Computer", JSDC, Dec. 1965, pp. 601-608.
Judd et al., "Color in Business, Science and Industry", Wiley, 1975.

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