reading each of the plurality of color charts with an image reading device and outputting m number of second reference color image signals corresponding to the first reference color image signals, each of {HEAD ~ the second reference color image signals} consisting of {TAIL ~ red, green, and blue components} having respective levels and represented by BR2k, BG2k, and BB2k 
reading each of the plurality of color charts with an image reading device and outputting m number of second reference color image signals corresponding to the first reference color image signals , each of { HEAD ~ the second reference color image signals } consisting of { TAIL ~ red , green , and blue components } having respective levels and represented by BR2k , BG2k , and BB2k
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