The capabilities of the Color library are limited to pure mathematical manipulation of the colors based on color theory without reference to color profiles (such as sRGB or Adobe RGB). For most purposes, when working with the RGB and HSL colors, this won't matter. However, some color models (like CIE La*b) are not supported because Color does not yet support color profiles, giving no meaningful way to convert colors in absolute color spaces (like La*b, XYZ) to non-absolute color spaces (like RGB).