Tag Archives: Color appearance phenomena

Purkinje effect

The Purkinje effect (sometimes called the Purkinje shift or dark adaptation) is the tendency for the peak luminance sensitivity of the human eye to shift toward the blue end of the color spectrum at low illumination levels. The effect is named after the Czech anatomist Jan Evangelista Purkyně. This effect…

Purkinje effect

Local color painting

In painting, local color is the natural color of an object unmodified by adding light and shadow or any other distortion. Local color is best seen on a matte surface, due to it not being reflected, and therefore distorted. In fine art realism and scientific descriptions of color perception, local…

Local color painting

Light reflectance value

In architecture, light reflectance value (LRV), is a measure of visible and usable light that is reflected from a surface when illuminated by a light source. The measurement is most commonly used by design professionals, such as architectural color consultants, architects, environmental graphic designers and interior designers. LRVs are frequently…

Light reflectance value

Helmholtz–Kohlrausch effect

The Helmholtz–Kohlrausch effect (after Hermann von Helmholtz and Rudolf Kohlrausch) is an entoptic phenomenon wherein the intense saturation of spectral hue is perceived as part of the color’s luminance. This brightness increase by saturation, which grows stronger as saturation increases, might better be called chromatic luminance, since “white” or achromatic…

Helmholtz–Kohlrausch effect

Chromatic adaptation

Chromatic adaptation is the human visual system’s ability to adjust to changes in illumination in order to preserve the appearance of object colors. It is responsible for the stable appearance of object colors despite the wide variation of light which might be reflected from an object and observed by our…

Chromatic adaptation

Bezold–Brücke shift

The Bezold–Brücke shift is a change in hue perception as light intensity changes. As intensity increases, spectral colors shift more towards blue (if below 500 nm) or yellow (if above 500 nm). At lower intensities, the red/green axis dominates. This effect is a problem for simple HSV-style color models, which…

Bezold–Brücke shift

Abney effect

The Abney effect describes the perceived hue shift that occurs when white light is added to a monochromatic light source. The addition of white light will cause a desaturation of the monochromatic source, as perceived by the human eye. However, a less intuitive effect of the white light addition that…

Abney effect

Dichromatism

Dichromatism (or polychromatism) is a phenomenon where a material or solution’s hue is dependent on both the concentration of the absorbing substance and the depth or thickness of the medium traversed. In most substances which are not dichromatic, only the brightness and saturation of the colour depend on their concentration…

Dichromatism

Color appearance model

A color appearance model (abbreviated CAM) is a mathematical model that seeks to describe the perceptual aspects of human color vision, i.e. viewing conditions under which the appearance of a color does not tally with the corresponding physical measurement of the stimulus source. (In contrast, a color model defines a…

Color appearance model

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