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The L*u*v* color space (also referred to as the CIELUV space) is
one of the uniform color spaces defined by the CIE in 1976. The values of L*, u*,
and v* are calculated according to the formulas below:
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where
Y: Tristimulus value Y (tristimulus value
can also be used.)
u', v': Chromaticity coordinates from the CIE 1976 UCS diagram
Yo, u'o, v'o: Tristimulus value Y (or
) and chromaticity coordinates u', v' of the perfect reflecting diffuser.
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Color difference ∆E*uv in the L*u*v* color space,
which indicates the degree of color difference but not the direction, is defined by the following equation:
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where
∆L*, ∆u*, ∆v*:
Difference in L*, u*, and v* values between the specimen color and the target color
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