News tagged with color

Related topics: light

A single DNA tweak leads to blond hair

A single-letter change in the genetic code is enough to generate blond hair in humans, in dramatic contrast to our dark-haired ancestors. A new analysis by Howard Hughes Medical Institute (HHMI) scientists ...

Jun 01, 2014
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Color vision tends to fade with age, study finds

(HealthDay)—Here's one more ability that seems to decline with age: color sense. A new study finds that many people lose their ability to clearly distinguish certain colors as they age, with losses typically ...

Mar 18, 2014
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The encoding of color categories in brain

(Medical Xpress) —The spectrum of visible light, like that of audible sound, spans a range of frequencies that is easy to define. There is both a minimum, and a maximum, that we can perceive. Our perception ...

Mar 10, 2014
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US weighs unknowns of 3-person embryo technique

(AP)—Genetic experts cautioned the U.S. government Tuesday that it could take decades to confirm the safety of an experimental fertilization technique that would create babies from the DNA of three people, with the aim ...

Feb 24, 2014
popularity 4.5 / 5 (2) | comments 1

Color vision problems become more common with age

Abnormal color vision increases significantly with aging—affecting one-half or more of people in the oldest age groups, reports a study in Optometry and Vision Science, official journal of the American Academy of Optome ...

Feb 20, 2014
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Fending off frostbite in frigid temperatures

Veronica Sikka, M.D., Ph.D, assistant professor in the Department of Emergency Medicine, VCU School of Medicine, works in the emergency department at VCU Medical Center.

Jan 24, 2014
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Predicting human body height from DNA

Predicting adult body height from genetic data is helpful in several areas such as pediatric endocrinology and forensic investigations. However, despite large international efforts to catalogue the genes ...

Nov 20, 2013
popularity 5 / 5 (1) | comments 0 | with audio podcast

Color

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 power 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 spectral 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, 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 we commonly refer to simply as light).

This text uses material from Wikipedia licensed under CC BY-SA