Purpose: The CIE L*C*h or CIE LCh color scale is an approximately uniform scale with a polar color space. The CIE LCh scale values are calculated from the CIE LAB scale values. They are described in Section 4.2 of CIE Publication 15.2 (1986). The L*, lightness, value is the same in each scale. The C* value, chroma, and the h value, hue angle, are calculated from the a* and b* of the CIE LAB scale. 

The basic delta values for this scale are delta L*, delta C*, and delta H*. They are the differences between the sample and standard in L*, C*, and h*. The total color difference, delta E* is the same as the delta E* in the CIELAB scale.

Another total color difference value often used with this color scale is delta Ecmc. Delta Ecmc and associated values will be discussed in a separate Applications Note. Please refer to it for further information.

Conditions for Measurement

Instrumental: Any HunterLab color measurement instrument

See attached for the complete article with illustrations and Mathematical Formulas.

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