Color detecting device for color printer

Details Color detecting device for color printer Color detecting device for color printer

1978-05-22

1981-01-13

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Photography

354 38, G01J 346, G03B 2778

Patent

active

042446546

ABSTRACT:
Red, green and blue densities of a color negative are measured at a plurality of points thereon. The measured densities are normalized by a normalizing circuit so that the same levels of density signals can be obtained regardless of the gamma value and sensitivity of the negatives when the same subject matter is photographed under the same conditions. The normalized density signals are plotted in a chromaticity coordinate system and examined as to whether or not they fall within a given region defining a polygon in the coordinate system. The coordinate system is a two dimensional coordinate system in which the axes thereof represent the combinations of two color densities among red, green and blue densities. When the level of the normalized signals with respect to a given point falls within the given region defined by the polygon, the point is determined to have the particular color.

REFERENCES:
patent: 3653759 (1972-04-01), Klein
patent: 4120581 (1978-10-01), Takahashi et al.

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