Color

related topics
{math, energy, light}
{@card@, make, design}
{style, bgcolor, rowspan}
{theory, work, human}
{disease, patient, cell}
{specie, animal, plant}
{system, computer, user}
{acid, form, water}
{black, white, people}
{language, word, form}
{film, series, show}
{food, make, wine}

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 energy 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 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. 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).

Contents

Full article ▸

related documents
Mirror
Planetarium
Optical microscope
Color temperature
Pinhole camera
Passive solar building design
Compass
Amateur telescope making
Retroreflector
Galvanometer
Aperture
Retrograde and direct motion
Electromagnetism
Alcubierre drive
Nucleon
Hall effect
Velocity
Star cluster
Focal length
Map projection
Geographic coordinate system
Superfluid
Vulcan (hypothetical planet)
Electrical impedance
Zodiac
Phobos (moon)
Comoving distance
Red dwarf
Čerenkov radiation
Kinetic theory