Patent ID: 8805060

Claim:
A color conversion device, which converts an image signal in a first color space into an image signal in a second color space corresponding to an image output unit, comprising: a color conversion table storing unit which stores a color conversion table, the color conversion table stores color conversion data used to convert an image signal in a third color space, corresponding to a plurality of lattice points into the image signal in the second color space; a first color conversion unit which converts the image signal in the first color space into the image signal in the third color space with one-to-one correspondence; a second color conversion unit which converts the image signal in the third color space into the image signal in the second color space based on the color conversion data stored in the color conversion table, wherein: the first color conversion unit converts an image signal corresponding to a reference color in the first color space into an image signal corresponding to the lattice points in the third color space, the third color space having a color range containing a color range of the second color space, the image signal in the first color space is only received by the first color conversion unit prior to performing color conversion on the image signal in the first color space, the image signals not positioned at the lattice points are color-converted based on the color conversion data calculated by interpolation using color conversion data provided at the nearby lattice points, and the first color conversion unit converts the image signal in the first color space into the image signal in the third color space by matrix calculation using a color conversion matrix; and a color conversion matrix producing unit which produces the color conversion matrix, wherein: the color conversion matrix producing unit selects the image signal corresponding to the reference color in the first color space which is stored in the color conversion table, and produces the color conversion matrix such that the color range of the third color space of the selected image signal contains the color range of the second color space, and the color conversion matrix producing unit repeats selection of the image signal corresponding to the reference color stored in the color conversion table and production of the color conversion matrix until the color range of the third color space of the selected image signal contains the color range of the second color space.