Method and apparatus for the analysis of color casts in color or

Details Method and apparatus for the analysis of color casts in color or Method and apparatus for the analysis of color casts in color or

1994-09-19

1995-05-30

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358518, 358522, G03F 308

Patent

active

054207045

ABSTRACT:
A method and apparatus for the analysis of a color cast in a color original to be reproduced, by evaluating color values acquired by point-by-point and line-by-line, trichromatic scanning with an image processing input device. For acquiring a color cast in the color original, a region of high luminance values (light image region) and/or a region of low luminance values (dark image region) of the luminance component L* of the color values L*, a*, b* in the color original to be analyzed is/are subdivided into at least one luminance region. The value of a potentially existing color cast in the luminance region is identified by averaging the color components a*, b* of the color values L*, a*, b* in the luminance region. The color cast value to be utilized for the evaluation of the color cast analysis is formed by selection and/or combination of color cast values identified for individual luminance regions. In addition, at least one luminance region is demarcated to form an analysis region in view of the chrominance c* by forming chrominance regions around the gray axis of the color space, whereby the demarcated analysis region is then utilized for calculating a potential color cast.

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