Verfahren zur Umwandlung von Farbendaten einer Lichtquelle und Farbendaten eines nichtleuchtenden Objektes

In a method for mutual transformation between the data of a light-source color on a color CRT monitor and the data of a non-luminous object color perceived as matching with the light-source color, the transformation can be performed by using any of the following two formulas: RC( lambda ) = [IC( lambda )/IG( lambda )]RG( lambda ); and wherein: Both RC( lambda ), and X, Y and Z express the non-luminous object color data which are designated at a spectral reflectance factor and the CIE tristimulas values, respectively; and Both IC( lambda ), and RC, GC and BC express the light-source color data, which are designated at a spectral distribution and the RGB video drive signals, respectively. Unknown parameters RG( lambda ) and IG( lambda ) and kR, kG and kB, which are used in the two formulas above, are determined by visual color matching under the Color Comparison Condition in which the light-source color on the color CRT monitor and the non-luminous object color are placed side by side so that they may be simultaneously observed. A color comparator system for use in the method is also provided.