We seem to perceive it in something closer to hsl space (3d) than rgb space (also 3d). You can tell that it's "purple" but you can also tell whether it's satura

We seem to perceive it in something closer to hsl space (3d) than rgb space (also 3d). You can tell that it's "purple" but you can also tell whether it's saturated or not, and if it's bright or dark purple. Also check out Lab space: http://en.wikipedia.org/wiki/Lab_color_space http://en.wikipedia.org/wiki/Lab_color_space