Color
Color is an important part of human expression.
Color or colour[1] (in American and British English, re-
spectively) is the visual perceptual property correspond-
ing in humans to the categories called red, yellow, blue
and others. Color derives from the spectrum of light
(distribution of light energy versus wavelength) inter-
acting in the eye with the spectral sensitivities of the
light receptors. Color categories and physical specifica-
tions of color are also associated with objects, materials,
light sources, etc., based on their physical properties
such as light absorption, reflection, or emission spectra.
Colors can be identified by their unique RGB and HSV
values (see List of colors).
Typically, only features of the composition of light
that are detectable by humans (wavelength spectrum
from 380 nm to 740 nm, roughly) are included, thereby
objectively relating the psychological phenomenon of
color to its physical specification. Because perception of
color stems from the varying 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 physic-
al or physiological quantifications of color, however, do
not fully explain the psychophysical perception of color
appearance.
The science of color is sometimes called chromatics. 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).
Physics of color
The colors of the visible light spectrum[2]
color
wavelength interval
frequency interval
Continuous optical spectrum (designed for monitors with
gamma 1.5).
red
~ 700–630 nm
~ 430–480 THz
orange ~ 630–590 nm
~ 480–510 THz
yellow ~ 590–560 nm
~ 510–540 THz
green
~ 560–490 nm
~ 540–610 THz
blue
~ 490–450 nm
~ 610–670 THz
violet
~ 450–400 nm
~ 670–750 THz
Color, wavelength, frequency and energy of light
Color