Patent ID: 8045796

Claim:
An image processing device that performs color conversion processing using a lookup table (LUT), comprising: acquiring means for acquiring an emulation LUT for applying emulation of a gamut to a target device from a device in use, the emulation LUT being generated using (i) a device-in-use LUT for performing correction corresponding to input and output characteristics of the device in use and (ii) a target device LUT for performing correction corresponding to input and output characteristics of the target device; generating means including first LUT arithmetic means for updating, for each lattice point forming the target device LUT, a value of the lattice point to a value obtained by gamut-converting the value of the lattice into a gamut of the device-in-use, and second LUT arithmetic means for updating a value of a lattice point forming the target device LUT updated by the first LUT arithmetic means to a value of a lattice point forming the device-in-use LUT, wherein the second LUT arithmetic means finds, from the device-in-use LUT, a lattice point closest to the value of the lattice point forming the target device LUT updated by the first. LUT arithmetic means and updates a value of the lattice point found to the value of the lattice point forming the target device LUT updated by the first LUT arithmetic means; and converting means for performing gamut conversion in performing the emulation using the emulation LUT acquired by the LUT acquiring means.