Oh I knocked up a quick program to interpolate between two colours in RGB 
space and Yuv space.  In each pair, the top version is RGB, the lower 
version is Yuv.

Actually, I just realised, you were probably thinking of the YUV signals 
used in TV, that are just linear combinations of RGB.  I'm talking about the 
CIE Yuv color space, revised in 1976 so that colours are spread equally in 
the uv plane.  See:

http://hyperphysics.phy-astr.gsu.edu/hbase/vision/cie1976.html

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