The light

Lightness is a dimensionless quantity that characterizes the difference in the subjective perception of brightness of two adjacent same-color surfaces.

Lightness measures how much lighter or darker one surface appears to a person than another surface of the same color. The greater the difference in the perceived brightness of two surfaces, the greater the difference in their lightness.

Lightness depends not only on the objective characteristics of illumination and the reflectivity of surfaces, but also on the characteristics of visual perception. The same pair of surfaces can be perceived differently by different people.

Lightness is an important parameter when choosing colors in design, painting, and printing. Taking into account lightness relationships helps create harmonious color combinations.

Lightness is a dimensionless physical quantity that characterizes the quantitative difference in the perceived brightness of two same-color adjacent surfaces in colorimetry and color theory.

Lightness measures the difference in color between two adjacent surfaces. These surfaces can be different colors (for example, blue and red) or different shades of the same color. The smaller the difference in color between these surfaces, the lower the lightness.

In colorimetry, color is described in terms of complex numbers called color coordinates. Lightness is defined as the sum of the squares of three color coordinates. This value is related to the wavelength of light reflected from the surface. If the wavelength is close to the wavelength of the absorbed pigment in the pigment that is applied to the surface, then the pigmentation of the surface appears stronger than the wavelength of the light source and becomes brighter. This can be achieved when a combination of several wavelengths of light is used to produce a source with the desired luminosity, called target luminance