Color Color Color (American English), or colour (Commonwealth English), is the characteristic of human visual perception described through color "categories", with names such as red, orange, yellow, green, blue, or purple. This perception of color derives from the stimulation of cone cells in the human eye by electromagnetic radiation in the visible spectrum. Color categories and physical specifications of color are associated with objects through the wavelength of the light that is reflected from them. This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc. By defining a color space, colors can be identified numerically
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