tone (value)

tone (value) (In French tonalité, valeur tonale) relative brightness degree, (i.e. with respect to a minimum (e.g. paper white) and a maximum (solid tone). The tone value can be reproduced without structure as a continuous tone (measurable as optical density) and with structure as a pixel tone or half tone (measurable as integral optical density) and also as color value (measurable as color density and/or chromaticity coordinates).