hue

Hue refers to the attribute of colors that allows them to be classified as red, yellow, green, blue, or an intermediate shade between these colors. It is one of the three primary dimensions of color, alongside saturation and brightness, which together precisely specify a color.12

Hue is the aspect of color commonly associated with terms like red, orange, and yellow. Primary hues such as red, yellow, and blue are the foundational colors from which others can be mixed on the chromatic scale. When light falls on an object, hue becomes apparent, distinguishing it from objects of identical form. While the eye and brain can compensate for different lighting conditions to perceive consistent colors (color constancy), subtle differences can lead to variations in perceived hue, a phenomenon known as metamerism.2345