Patent ID: 8368977

Claim:
A method for creating 4×4 LUTs without use of a device link profile, comprising the steps of: building a K to K LUT having a particular node spacing, wherein said K to K LUT is constructed by: creating a K to K transform; creating an array of CMYK values ranging from [0, 0, 0, 0] to [0, 0, 0, 255]; passing said array backwards through a source ICC profile and a destination ICC profile to yield a source L*a*b and a destination L*a*b; matching said source L*a*b and said destination L*a*b based on a minimum L* difference; and determining a minimum Delta E between said source L*a*b and said destination L*a*b, wherein said minimum Delta E is used as a node value to construct said K to K LUT; constructing CMYK values along a regularly spaced grid ranging from [0,0,0,0] to [255,255,255,255] utilizing the particular node spacing of said K to K LUT; creating a CMYK to CMYK LUT by passing said regularly spaced grid through a CMYK to CMYK transform wherein LCMS is used to construct a source to destination CMYK to CMYK transform; merging the K to K LUT with the CMYK to CMYK LUT to create a 4×4 LUT; and writing the 4×4 LUT to a known file format; said method being executed without use of a device link profile at RIP time within a color rendering device to optimize code for performance.