tone

In art, the quality and depth of a colour, particularly the gradations from light to dark. A colour may be ‘toned down’ to make it less vivid, or ‘toned up’ to make it more solid or brighter. Tonality refers to the general effect of the tones of a painting, and tonal value describes the relationship of tone between one part of a painting and another. A tonal drawing is different to a line or contour drawing, as it includes the tones or shades of the objects being viewed.