Medical research

New model simulates the temperature rise of laser-heated skin

Laser treatment is now commonplace across various fields of medicine including dermatology, where it is commonly used to remove scars, wrinkles, and freckles. The technology, however, has a major downside: despite continued ...

Psychology & Psychiatry

Colors evoke similar feelings around the world

People all over the world associate colors with emotions. In fact, people from different parts of the world often associate the same colors with the same emotions. This was the result of a detailed survey of 4,598 participants ...

Genetics

New gene therapy for complete color blindness tested in patients

An initial trial in patients indicates that a new genetic treatment for complete color blindness, developed by research groups based in Tübingen and Munich is safe. Preliminary evidence for its efficacy has also been obtained.

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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).

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