Abstract: A table 10 is provided on which are registered a number of sets of color signals 11 which are formed by the combination of sets of an RGB signal 12 to be supplied to a color display 16 to display the same color, a YMC(Bk) signal 13 to be supplied to a color printer 6 and a reflectivity signal 14 of a corresponding color. Computers 31 and 32 are provided for computing dye recipes, wherein the reflectivity signal 14 of a color displayed on the color display 15 is retrieved from the table 10 and a recipe of dye necessary for reproducing the same color as that displayed on a textile is computed and then outputted.