US Patent 7417763 Data processing apparatus and method, and image processing apparatus

A method of reconstructing the content of an ink color decomposition table is available as a method calibrating second- and higher-order colors. However, it is difficult to reconstruct the ink color decomposition table while maintaining a limitation upon the overall amount of ink allowed by the printing paper. Accordingly, a printer is made to form a color patch that corresponds to the signal value of a color to be calibrated, the signal value is calibrated based upon the measured color value of the color patch formed and a target value that corresponds to the signal value of the color to be calibrated, and multidimensional table data for calibration is created based upon the measured color value of the color patch formed.