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CIE Colour Difference Formula.

The difference between two colours can be evaluated in CIELUV space as:

	DE*uv = [(DL*)^2 + (Du*)^2 + (Dv*)^2]^0.5
where DL* is the difference between the L* values for the two colours and likewise for u* and v*. In CIELAB space the difference is evalutaed as:

	DE*ab = [(DL*)^2 + (Da*)^2 + (Db*)^2]^0.5