quadtone

Etymology

From quad- + tone.

quadtone means An interval of four whole tones. Lexicurio rates it Rare gem — a strength score of 79 out of 100.

noun

An interval of four whole tones.
A picture printed in four shades.“In Photoshop’s Duotone mode you can create monotones, duotones, tritones, and quadtones—grayscale images to which you add one, two, three, or four colors.”