Calculating $$the $$perceptual $$difference $$between $$two $$colors $$in $$the $$relative $$RGB $$using $$the $$CIE $$Luv $$space $$is $$not $$as $$easy $$as $$it $$seems$.$ What are the steps that are required? You might want to take a look at the Poynton color FAQ and gamut FAQ in order to solve this question. Provide an example of the two color differences i$.$e$.,$ a reference color and two colors that are perceptually at the same difference.