1. A method comprising: scanning a test sheet having test patches to produce scanned test device-dependent values using a scanner; measuring test device-independent color space values of said patches on said test sheet using a color measuring instrument separate from said scanner; calculating an initial matrix by correlating said scanned test device-dependent values to said test device-independent color space values, said initial matrix converting device-dependent values to device-independent color space values, and said initial matrix including conversion error; calculating an inverse matrix from said initial matrix; calculating target device-dependent values by applying said test device-independent color space values to said inverse matrix; deriving final one-dimensional look-up tables by correlating said scanned test device-dependent values and said target device-dependent values, said one-dimensional look-up table compensating for at least a portion of said conversion error; and deriving a final matrix specific to said scanner by applying said scanned test device-dependent values to said final one-dimensional look-up tables to produce adjusted device-dependent values, and correlating said adjusted device-dependent values to said test device-independent color space values, said final matrix converting device-dependent values to device-independent color space values, and said final matrix including less of said conversion error relative to said initial matrix.