<computer graphics> (Or "tone", "luminance", "value", "luminosity", "lightness") The coordinate in the HSB colour model that determines the total amount of light in the colour. Zero brightness is black and 100% is white, intermediate values are "light" or "dark" colours.

The other coordinates are hue and saturation.

(01 Apr 1999)

<microscopy> The brightness of an extended luminous source is termed the intensity per unit area measured in candles per cm exp2. Also, the intensity of reflection, it may be measured in lamberts, one lambert equals 1 lumen/cm exp2.

(05 Aug 1998)