Properties of color

Chroma

How colorful a color is compared with a gray of the same lightness. The "C" in OKLCH and LCh.

Also called colorfulness

Chroma is a measure of colorfulness that, unlike saturation, does not depend on lightness. A pale pink and a deep red can have very different chroma at the same hue.

Perceptual color spaces like OKLCH use chroma because it lines up better with what people actually see.

Guides that cover Chroma