Patent ID: 7760406
Filing Date: 2010-07-20
Classification: H04N

Abstract:
1. A color conversion definition creating apparatus that creates a color conversion definition which defines a color conversion relationship between a first color expression area expressing a range of colors that can be expressed by a first device that mediates between an image and image data and a second color expression area expressing a range of colors that can be expressed by a second device that mediates between an image and image data, comprising: an area conversion means for creating a plurality of conversion areas by executing an adaptive conversion of approximating a gray area in the first color expression area to a gray area in the second color expression area while causing areas other than the gray area to move following the gray area for each of a plurality of types of adaptive conversions having different ways of approximation; an intermediate area creating means for creating an intermediate area by combining a first conversion area excluding a conversion area which has a chroma range most different from the chroma range of the first color expression area out of the plurality of conversion areas created by the area conversion means and a second conversion area excluding a conversion area having a brightness range most different from the brightness range of the second color expression area out of the plurality of conversion areas created by the area conversion means; a definition creating means for creating the color conversion definition by combining a correlation between colors in the first color expression area and colors in the intermediate area, and a correlation between colors in the intermediate area and colors in the second color expression area, wherein using a target white point whose closeness to a white point in the second color expression area is greater than closeness of a white point in the first color expression area to the white point in the second color expression area and a target black point whose closeness to a black point in the second color expression area is greater than closeness of a black point in the first color expression area to the black point in the second color expression area, the area conversion means executes a first adaptive conversion of causing the white point in the first color expression area to match the target white point and a second adaptive conversion of causing the white point and black point in the first color expression area to match the target white point and target black point to thereby create two conversion areas; and a black and white calculating means for receiving degrees of similarity of the target white point and the target black point to a white point and black point in the second color expression area according to an operation and calculates a white point and black point according to the degrees of similarity, wherein the area conversion means uses the white point and the black point calculated by the black and white calculating section as the target white point and target black point.