A color conversion table creating device includes a gray data creating unit, light and dark area data creating unit, first grid point correspondence relationship determining unit, second grid point correspondence relationship determining unit including gray-dark auxiliary line setting unit, intersecting point setting and signal determining units, interpolation coefficient determining unit, and second grid point interpolation unit, and color conversion table creating unit. The device sets a gray-dark auxiliary line gray and dark intersecting points, The device determines, based on gray data and dark area data, output color signals corresponding to the gray-dark auxiliary line gray and dark intersecting points determines light interpolation coefficient reflecting characteristic of light area data, and determines a relationship for the second grid point between an input color signal and an output color signal by performing interpolation between the output color signals corresponding to the gray-dark auxiliary line gray and dark intersecting points by using the light interpolation coefficient.