This method is a newer calculation technology derived from CIELab equations. It uses the basic CIELab information, but presents the graphical information with a focus on chroma and hue that may be visually easier to understand than typical CIELab graphical presentations. CIELch converts the CIELab linear coordinates into polar coordinates of c (chroma) and h (hue). L remains as the lightness/darkness coordinate.

L – Absolute lightness or darkness on a scale of black to white.

c – Chroma as a radial in polar coordinates (higher chroma = deeper, stronger; lower chroma = weaker, more neutral).

h – Hue as an angle originating from the +a (red) axis in polar coordinates.

hab = arctan (b*/a*)

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