This effect can be visualized by comparing the light sources' spectral power distributions and the resulting colors. In each such class the members are called metamers of the color in question. In fact, one may formally define a color as a class of spectra that give rise to the same color sensation, although such classes would vary widely among different species, and to a lesser extent among individuals within the same species. Although the spectrum of light arriving at the eye from a given direction determines the color sensation in that direction, there are many more possible spectral combinations than color sensations. Most light sources emit light at many different wavelengths a source's spectrum is a distribution giving its intensity at each wavelength. When the wavelength is within the visible spectrum (the range of wavelengths humans can perceive, approximately from 390 nm to 700 nm), it is known as "visible light". The colors of the visible light spectrum ColorĬolor, wavelength, frequency and energy of lightĮlectromagnetic radiation is characterized by its wavelength (or frequency) and its intensity. 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 is commonly referred to simply as light).Ĭontinuous optical spectrum rendered into the sRGB color space. The science of color is sometimes called chromatics, colorimetry, or simply color science.
These physical or physiological quantifications of color, however, do not fully explain the psychophysical perception of color appearance. By defining a color space colors can be identified numerically by their coordinates.īecause 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. Color categories and physical specifications of color are also associated with objects or materials based on their physical properties such as light absorption, reflection, or emission spectra. 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 ( American English) or colour ( Commonwealth English) is the visual perceptual property corresponding in humans to the categories called blue, green, red, etc.
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