Knowra Color (visual perception) Color (visual perception) Color is the perceptual attribute produced by the visual system’s response to light. It depends on the light’s spectrum, viewing conditions, and the surfaces or sources observed.
Visible spectrum : The range of electromagnetic wavelengths detectable by the human visual system. Its wavelengths provide the physical signals from which color perception begins.
Light : Electromagnetic radiation that can transport energy and, within a limited range, stimulate human vision. Color perception depends on the light reaching the eye, not on objects alone.
Colorimetry : The measurement of color through standardized observers, illuminants, and numerical coordinates. It turns color matches into reproducible measurements despite variation in spectra.
Brightness : The perceived intensity of light emitted by or reflected from a visual source. Brightness varies independently of hue, though both contribute to an object's appearance.
Cone cell : A retinal photoreceptor specialized for vision in relatively bright conditions and for distinguishing wavelengths. Three classes of cones provide the main inputs for human color discrimination.
Wavelength : The distance between successive peaks of a wave, including a measure used to describe light. Wavelength helps characterize light, although mixtures and surface reflection complicate its relation to color.
CIE 1931 color space : A color-matching system defined by the Commission Internationale de l'Éclairage in 1931. Its tristimulus values provide a standard framework for specifying visual color matches.
Luminance : A photometric measure of light intensity weighted by the human eye's sensitivity to different wavelengths. It is a measurable light quantity, not the full experience of color.
Opponent process : A neural coding scheme that represents signals along opposing channels, such as red–green and blue–yellow. Opponent channels help explain color contrasts and why certain hue combinations are not perceived.
Reflectance : The proportion of incident light that a surface reflects at different wavelengths. A surface's wavelength-dependent reflectance shapes the light that produces its apparent color.
Show all 22