Patent ID: 8305390

Claim:
A color gamut forming apparatus comprising: a central processing unit; a reference color acquiring unit that sets at least a saturated color, which is reproducible on a contour of an input color gamut, as a reference input color and acquires a first reference output color which is a color obtained by converting the input reference color into a color being reproducible in an output color gamut; and a converted color gamut forming unit that forms, in the output color gamut, a converted color gamut in which the first reference output color corresponding to the saturated color on the contour of the input color gamut as a convex point, wherein if an intersecting point between (i) a first locus of colors obtained by converting only colors in a range from the saturated color on the contour of the input color gamut and increasing in lightness to a white color, into colors being reproducible in the output color gamut on a constant hue plane that passes the first reference output color and (ii) a second locus of colors, not a subset of the first locus of colors, obtained by performing color reproduction with primary colors on the contour of the output color gamut exists, then the reference color acquiring unit acquires a color in the intersecting point as a second reference output color, wherein the intersecting point is converted from a color other than any saturated color, and wherein the saturated color is a color other than black, and wherein at least one more color from the second locus of colors, but not from the first locus of colors, is acquired as a third reference output color, and the third reference output color has higher lightness than the second reference color.