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This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc.By defining a color space, colors can be identified numerically by coordinates.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 is commonly referred to simply as light).

The table at right shows approximate frequencies (in terahertz) and wavelengths (in nanometers) for various pure spectral colors.Most light sources emit light at many different wavelengths; a source's spectrum is a distribution giving its intensity at each wavelength.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.This perception of color derives from the stimulation of cone cells in the human eye by electromagnetic radiation in the spectrum of light.Color categories and physical specifications of color are associated with objects through the wavelength of the light that is reflected from them.