Martin scale match the Martin–Schultz scale, which is still used in biological anthropology. Older versions of the Martin scale eye color chart have the following color divisions: Martin scale The Martin scale is an older version of color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual; it was created by the anthropologist Martin in the first half of the 20th century. Later he improved this scale with cooperation of Dr. Schulz – the Martin-Schultz scale. The original Martin scale, summarized below, consists of 16 colors (from light blue to dark brown-black) that
Adams chromatic valence color space what Hunter used in his Lab color space. As with chromatic value, these functions are plotted with a scale factor of 2⅛ to give nearly equal radial distance for equal changes in Munsell chroma. Adams' color spaces rely on the Munsell value for lightness. Defining chromatic valence components formula_22 and formula_23, we can determine the difference between two colors as: where V is the Newhall-Nickerson-Judd value function and the 0.4 factor is incorporated to better make differences in W and W perceptually correspond to one another. In chromatic value color spaces, the chromaticity components are formula_25 and formula_26. The difference