Patent ID: 7855802
Filing Date: 2010-12-21
Classification: H04N

Abstract:
1. A color management method comprising: a source device transform step for transforming color data in an N-dimensional source device color space into color data in a three-dimensional device independent color space by applying a source device transform, and for generating out-of-band information which is non-calorimetric information; an appearance space transform step for transforming the color data in the device independent color space into color data in a three-dimensional device-independent and viewing condition independent color space by applying an appearance space transform; a gamut mapping step for applying a gamut mapping algorithm to the color data in the three-dimensional device-independent and viewing condition independent color space so as to accommodate differences between a color gamut of a source device and a color gamut of a destination device; an inverse appearance space transform step for transforming the gamut-mapped color data in the three-dimensional device-independent and viewing condition independent color space into the color data in the three-dimensional device independent color space by applying an inverse appearance space transform; and a destination device transform step for transforming the color data in the device independent color space into color data in an M-dimensional destination device color space by applying a destination device transform based on the out-of-band information from the source device transform, the method further comprising: a constructing step for constructing a three-by-three intermediate conversion LUT through the gamut mapping step and the inverse appearance space transform step; a first transform step for transforming first color data in the N-dimensional source device color space corresponding to an entry of an N-by-M LUT into second color data in the three-dimensional device-independent and viewing condition independent color space by performing the source device transform step and the appearance space transform step; a second transform step for transforming the second color data in the three-dimensional device-independent and viewing condition independent color space into third color data in the device independent color space by applying the three-by-three intermediate conversion LUT; a third transform step for transforming, by performing the destination device transform step, the third color data into fourth color data in the M-dimensional destination device color space based on the out-of-band information corresponding to the first color data; and a storing step for storing the fourth color data in the N-by-M LUT, wherein the first transform step, the second transform step, the third transform step and the storing step are performed for each entry of the N-by-M LUT.