Lightness (color)

The brightness is - in addition to hue and saturation - one of the three man-made perceived as fundamental properties of a color.

It describes how light or dark a body appears. The biggest difference between black and white in the bright colors between violet and yellow.

The colorimetric brightness differs from the more general photometric brightness fact that it is on the one hand, based on a comparison color ( usually an achromatic point, such as a reference white or black or gray ), and on the other hand, the Weber -Fechner law of perception follows the logarithmic one establishes relationship between perceived and measured light intensity.