Module hct 

Structs

Cam16

CAM16, a color appearance model. Colors are not just defined by their hex code, but rather, a hex code and viewing conditions.

Hct

ViewingConditions

In traditional color spaces, a color can be identified solely by the observer’s measurement of the color. Color appearance models such as CAM16 also use information about the environment where the color was observed, known as the viewing conditions.