producing a plurality of color charts upon successively applying m number of first reference color image signals to said color image reproducing means, each of the m number of first reference color image signals consisting of {HEAD ~ red, green, and blue components} having {TAIL ~ respective levels} and represented by ARk, AGk, and ABk, respectively, where k is one of a plurality of natural numbers in a range of one to m 
having
producing a plurality of color charts upon successively applying m number of first reference color image signals to said color image reproducing means , each of the m number of first reference color image signals consisting of { HEAD ~ red , green , and blue components } having { TAIL ~ respective levels } and represented by ARk , AGk , and ABk , respectively , where k is one of a plurality of natural numbers in a range of one to m
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