Martin scale 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 correspond to the different eye colors observed in nature due to the amount of melanin in the iris. The numbering is reversed in order to
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