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 {HEAD ~ first reference color image signals} consisting of red, green, and blue components having respective levels and represented by ARk, {TAIL ~ AGk}, and ABk, respectively, where k is one of a plurality of natural numbers in a range of one to m 
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 { HEAD ~ first reference color image signals } consisting of red , green , and blue components having respective levels and represented by ARk , { TAIL ~ 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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