Patent ID: 7576889

Claim:
A method of color transformation of image data on a computer, the method comprising: receiving, by the computer, image data configured in a first color space; processing the image data by a first unit of at least two units of the computer to generate a first output, each unit of the at least two units comprising a combination of a plurality of look-up tables and a M×N matrix; and processing the generated first output by a second unit of the at least two units of the computer to generate a second output comprising output image data in a second color space, wherein one of the first and second color spaces is a device dependent color space and the other of the first and second color spaces is a device independent color space, at least one of the step of processing the image data by the first unit and the step of processing the image data by the second unit includes processing the image data by the corresponding plurality of look-up tables by a scaled sigmoid function, and the output image data in the second color space is a more accurate translation of the image data from the first color space into the second color space than is achievable by translating the image data from the first color space into the second color space using only three one-dimensional look-up tables and one 3×3 matrix.