The brightness (luminance, brilliance) of an object refers to the quality, apart from hue and saturation that an observer uses to determine the comparative brightness of another object.

In terms of tonal differences, pure white has the maximum brightness, and pure black the minimum brightness.

In terms of colour, a pure yellow may appear to be much brighter than a pure blue.

  • Brightness is a colour coordinate in the HSB colour model.
  • Brightness is the perception elicited by the luminance of a visual target.
  • Brightness should not be confused with lightness.
  • In general terms, brightness is an attribute of visual perception used to refer to whether one object appears to be radiating or reflecting more or less light than another.
  • The field of photometry, the science of the measurement of light, recognises that the human eye is not equally sensitive to all wavelengths of visible light.