Optics: measuring and testing – By shade or color
Patent
1996-06-04
2000-04-18
Kim, Robert H.
Optics: measuring and testing
By shade or color
356405, 356406, 356408, 356419, 356425, G01J 346
Patent
active
060521945
ABSTRACT:
A method and apparatus for controlling the color of an article such as a paper web includes performing a comparison between target and measured reflectance values in numerous wavelength bands spanning the visible spectrum. The comparison quantifies correspondingly numerous errors that are modified by a non-linear operation, such as squaring, and then added together. The resulting sum is minimized by individually adjusting the application of a number of colorants to the article. The number of wavelength bands is greater than the number of colorants. This avoids metameric effects which are common in conventional systems that rely on three color space coordinates such as Hunter Laboratories L, a, b; C.I.E. L*, a*, b*; chromaticity x, y, z; and tristimulus X, Y, Z. Colorant response simulators enable the effects of changes in application of colorants to be tested while the actual application of colorants to the article is unchanged.
REFERENCES:
patent: 4256131 (1981-03-01), De Remigis
patent: 5082529 (1992-01-01), Burk
patent: 5182721 (1993-01-01), Kipphan et al.
Kim Robert H.
Valmet Automation (Canada) Ltd.
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