US Patent 7417766 Calibration of color devices

A method of adjusting a non-black primary color value including determining first, second and third portions of the non-black primary color value; determining an adjusted first portion using a first one-dimensional look-up table, wherein the first portion is used as an index to the first one-dimensional look-up table; determining an adjusted second portion using a second one-dimensional look-up table, wherein the second portion is used as an index to the second one-dimensional look-up table; and summing the adjusted first portion, the adjusted second portion and the third portion.