The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2002
Filed:
Jul. 10, 1998
Abstract
A CPU assumes a virtual color monitor in which actual chromaticity coordinates of colors expressed by fluorescent materials are replaced by virtual chromaticity coordinates having the same hues as those of the actual chromaticity coordinates but higher saturations than those of the actual chromaticity coordinates. The CPU converts colorimetric values X, Y, and Z into luminance-linear values r′, g′, and b′ for red, green, and blue, based on a relationship of color conversion for the virtual color monitor at step S . The CPU then sets any one of the values r′, g′, and b′ to L at step S and compares the value L with i at step S , where i is the &ggr;-th power of j and greater than 0. In case that the value L is less than i, the CPU calculates a value c based on the remaining values other than the value L among the values r′, g′, and b′ at step S . When −ck≦L<0, conversion of the value L into V is carried out according to a linear function of L, in which an L intercept is varied with a variation of the value c, at step S . In case that the value L is not less than i, on the other hand, the CPU carries out conversion of the value L into V according to a function of 1/&ggr;-th power of L at step S . At subsequent step S , the CPU sets the value V thus obtained to one of display signals R, G, and B corresponding to one of the values r′, g′, and b′ set at step S . This color conversion process effectively prevents abnormal tone or a change in hue in an area of a desired color that is out of a reproducible color range.