| 摘要 |
PURPOSE: To increase the precision of a parameter group and improve the quality of an obtained image by determining parameters of image conversion according to colors that the processor can handle. CONSTITUTION: As a color patch original 312, (n) reference colors are prepared. A data group obtained by measuring the respective colors of the color patch 312 by a Lab color specification system is denoted as Pi (i=1-n). A color patch generation processing part 314 excludes colors having calculated color differencesΔE exceeding a threshold value T given by an expression from the measured data group Pi (i=1-n) and generates a color patch based upon the new measured data group Pi'. The data are read in through a scanner and converted to a Lab system to generate a new input data group Qi and data groups P'315 and Q'317 are used to find a parameter group X minimizing the specific expression. Thus, the parameters of color conversion are determined according to the colors that the scanner can handle.
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