Related topics: light

Researchers question the cooperative eye hypothesis

The sclera of the eye is devoid of pigment, which is why humans can easily follow where counterparts are looking. Researchers have long believed this facilitates glance-based communication. A team of zoologists based at the ...

Age-related stem cell dysfunction linked to eye-color gene

In a discovery with implications for colorectal cancer in humans, RIKEN geneticists have found that a gene that determines eye color in fruit flies also plays a role in the tendency of gut stem cells to proliferate out of ...


Color or colour (see spelling differences) is the visual perceptual property corresponding in humans to the categories called red, green, blue and others. Color derives from the spectrum of light (distribution of light power versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Color categories and physical specifications of color are also associated with objects, materials, light sources, etc., based on their physical properties such as light absorption, reflection, or emission spectra. By defining a color space, colors can be identified numerically by their coordinates.

Because perception of color stems from the varying spectral sensitivity of different types of cone cells in the retina to different parts of the spectrum, colors may be defined and quantified by the degree to which they stimulate these cells. These physical or physiological quantifications of color, however, do not fully explain the psychophysical perception of color appearance.

The science of color is sometimes called chromatics, colorimetry, or simply color science. It includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what we commonly refer to simply as light).

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