Method and apparatus for measuring and controlling the color of

Optics: measuring and testing – By shade or color – With sequential comparison of sample and standard

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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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