Yu'v' colorspace is a Chromaticity space, since its primary
purpose is to provide two coordinates that display the hue and
saturation of a color. The Y value is that of the XYZ, while the u' and v' are
projections of the X and Y values:
Y = Y |
u' = 4 X / (X + 15 Y+ 3 Z) |
v' = 9 Y / (X + 15 Y+ 3 Z) |