Brightness (color)
The brightness (also brightness , dark shade , light-dark value , Valeur , English: lightness or value ) is a color feature . In addition to hue and saturation , lightness is one of the three characteristics or properties of a color that people perceive to be fundamental .
It describes how light or dark a body appears. The biggest difference is between black and white , and the bright colors between purple and yellow .
The colorimetric brightness differs from the more general photometric brightness in that, on the one hand, it is related to a comparison color (usually an achromatic point , such as a reference white or black or gray) and, on the other hand, it follows the Weber-Fechner law of perception, which is a logarithmic one Establishes a connection between perceived and measured light intensity .