| http://www.w3.org/ns/prov#value | - L*u*v* color specification system, FIG. 6 is an illustration for curve approximation, FIG. 7 is an illustration for expansion of the target value obtained in FIG. 6, FIG. 8 shows the L*u*v* color specification system, FIG. 9 shows the Y, M and K coordinate systems, FIGS. 10 and 11 show the relationship the same as that of FIGS. 8 and 9, FIGS. 12 and 13 are illustrations for convergence operations,
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