Oct 5, 2022


A measure of the average tangential change in hue, relative to a standardized reference illuminant, for colors within an ANSI/IES TM-30 hue angle bin, hj (j = 1 – 16), referenced to the center of the hue bin angle.

Note: Positive values indicate a counterclockwise shift (e.g., red to orange), negative values indicate a clockwise shift. Possible values: Approximately -1 to 1 (varies by hue). Typical values: Approximately -0.2 to 0.2 (varies by hue).

« Back to Definitions Index