Patent ID: 7209145

Claim:
A method of mapping first device dependent color space values to second device dependent color space values, comprising: using first tonal reproduction curves and a first 3×3 matrix to map first device dependent color space input values to profile connection space values; using a second 3×3 matrix that is an inverse of the first 3×3 matrix and second tonal reproduction curves that are an inverse of the first tonal reproduction curves to map the profile connection space values to intermediate color space values, wherein a range of the intermediate color space values along each of three dimensions is from (0+INT−E 0 ) to (MAX−INT+E 1 ); using a G×G×G look-up table to map the intermediate color space values to second device dependent color space output values, wherein the outermost nodes of the G×G×G look-up table comprise replicas of the outermost nodes of a (G−2)×(G−2)×(G−2) inner portion of the G×G×G look-up table; and wherein each of E 0 and E 1 is greater than 0 and less than a grid interval INT of the G×G×G look-up table along each of three dimensions, wherein MAX is a positive integer, and wherein a range of indexes associated with the G×G×G look-up table along each of three dimensions is 0 to MAX.