Definition: (1) Level of brightness of pixel or colour as defined in HSV (Hue Saturation Value) colour space. (2) Designation of lightness of colour in the Munsell system of colour nomenclature. (3) Tone or brightness of a colour as assessed subjectively: high values give light colours, low value colours are dark in appearance. (4) The step or zone, in the Zone System, which corresponds to a certain range of subject brightness. (5) Camera setting or range of settings based on scales of shutter time, lens aperture, exposure value, luminance and film speed. * Known as APEX system.

Related Terms: EV

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