Patent ID: 6234801
Filing Date: 2001-05-22
Classification: G09F

Abstract:
A hue comparison device, comprising:means for substantially precise identification of a hue by a hue angle, hue chroma and hue depth value,said identification means comprising:a plurality of hue sheets arranged in a three-dimensional structure, each said hue sheet including:(a) a central standard gray area located in the center of said hue sheet, and(b) a plurality of hue blocks filled with respective hues displayed on said each hue sheet, each of said hue blocks occupying a predetermined angular position on said hue sheet with the hue angle thereof corresponding to said angular position identifying a particular spectrum area of the hue filling said hue block,wherein said hue blocks are arranged on said hue sheet in a plurality of coaxial hue circles surrounding said central standard gray area, with hue blocks of the same hue circle being equidistantly displaced from said central standard gray area and having the same chroma parameter,wherein said chroma parameter of the hue circles increases in predetermined increments in the direction from the center to periphery of said hue sheet,wherein the difference in the number of the hue blocks in adjacent hue circles equals six hue blocks,wherein said standard gray is being obtained as a result of mixing together of at least three hues of the hue blocks spaced equidistantly on the same hue circle, andwherein, in said three-dimensional structure, said hue sheets being arranged in a predetermined order with said central standard gray area changing from the darkest to the lightest in predetermined increments of the standard gray.