I have some questions regarding some confusion about color spaces, and since it is fairly graphics related, I was hopping somebody here could help me understand.

The first thing that I'm confused with is how ambiguous some of the terms for various color spaces are. It's hard to get an idea of how they relate to each other when it seems like they are the same but different. E.g. what is the difference between UV (as in YUV), U'V' (as in YU'V'), u*v* (as in L*u*v*) and U*V* (as in U*V*W*)? It seems like the CIE has defined U and V enough times to drive me bonkers.

Another thing that bothers me is that I've seen YUV referred to as being device dependent, while XYZ and xyY are device independent. That makes no sense to me because here it states that YUV is just a linear transformation of xyY which in turn is just a linear transformation of XYZ.

Lastly (I think), I have seen the Y in XYZ referred to as both luminance and lightness. This is extremely confusing because the Y in YUV stands for luminance while the L in LUV stands for lightness. YUV != LUV see my confusion?

This is probably just the start of my confusion. Any help in making heads or tales of this would be appreciated.