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Color or colour[1] is the visual perceptual property corresponding in humans to the categories called red, yellow, 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. Typically, only features of the composition of light that are detectable by humans (wavelength spectrum from 380&_160;nm to 740&_160;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 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). 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. 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. In each such class the members are called metamers of the color in question.
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Color Subcategories
Color Articles
Why Don't You Testify
by charen smith
Jan 04, 2009
Testimonials are vital to any business coming out with their marketing campaign such as brochure printing. Whether you’re marketing or selling your product or service, ...
Take Advantage of Outside Events
by Chelsea Nicole
Nov 12, 2008
A general rule of thumb is that whenever you’re hosting some kind of event, or going to some kind of event, you want to make sure to keep as strong of an advertising presence there as possible. The best kind of marketing push will go beyond ju...
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