Property of light sources related to black-body radiation
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The CIE 1931 x,y chromaticity space, also showing the chromaticities of black-body light sources of various temperatures (Planckian locus), and lines of constant correlated color temperature
Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective body. The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source. Color temperature is usually measured in kelvins. The color temperature scale describes only the color of light emitted by a light source, which may actually be at a different (and often much lower) temperature.
Color temperature has applications in lighting, photography, videography, publishing, manufacturing, astrophysics and other fields. In practice, color temperature is most meaningful for light sources that correspond somewhat closely to the color of some black body, i.e., light in a range going from red to orange to yellow to white to bluish white. Although the concept of correlated color temperature extends the definition to any visible light, the color temperature of a green or a purple light rarely is useful information. Color temperature is conventionally expressed in kelvins, using the symbol K, a unit for absolute temperature.
Color temperatures over 5000 K are called "cool colors" (bluish), while lower color temperatures (2700–3000 K) are called "warm colors" (yellowish). "Warm" in this context is with respect to a traditional categorization of colors, not a reference to black body temperature. The hue-heat hypothesis states that low color temperatures will feel warmer while higher color temperatures will feel cooler. The spectral peak of warm-colored light is closer to infrared, and most natural warm-colored light sources emit significant infrared radiation. The fact that "warm" lighting in this sense actually has a "cooler" color temperature often leads to confusion.[1]
^See the comments section of this LightNowBlog.com article Archived 2017-03-07 at the Wayback Machine on the recommendations of the American Medical Association to prefer LED-lighting with cooler color temperatures (i.e. warmer color).
Colortemperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective...
The correlated colortemperature (CCT, Tcp) is defined as "the temperature of the Planckian radiator whose perceived color most closely resembles that...
filters, to alter the overall color of the light. Typically the light color is measured on a scale known as colortemperature, as well as along a green–magenta...
Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness. Temperature is measured with a thermometer. It reflects...
astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. The lower...
describes the change of color perception and pleasingness of light as a function of temperature and intensity. While the mechanisms of color vision at the level...
of the colortemperature of (e.g. a green or a purple light). Colortemperature is conventionally stated in the unit of absolute temperature, the kelvin...
name "Ambilight". Bias lights with a colortemperature of 6,500 K match the temperature of most monitors' white color, which is derived from the CIE standard...
light passing through or reflected by a subject. A colortemperature meter measures the colortemperature of an incident illuminant. In digital imaging, colorimeters...
Timeline of temperature and pressure measurement technology Conversion of scales of temperatureColortemperature Planck temperatureTemperature data logger...
does not indicate the apparent color of the light source; that information is given by the correlated colortemperature (CCT). The CRI is determined by...
spectral composition, and may be gauged by its color rendering index (CRI). Correlated colortemperature (CCT) is a measure of the "shade" of whiteness...
color mixing, color contrast effects, color harmony, color schemes and color symbolism. Modern color theory is generally referred to as Color science. While...
correlated colortemperature). Colortemperature can be indicated in kelvins or mireds (1 million divided by the colortemperature in kelvins). The color temperature...
watts, the colortemperature in kelvins or a color description such as "warm white", "cool white" or "daylight", the operating temperature range, whether...
for color correction, such as CTB (colortemperature blue) and CTO (colortemperature orange). Color correction gels alter or correct the color temperature...
temperature" of the Sun—the temperature at the centre of the Sun where nuclear reactions take place—is estimated to be 15,000,000 K. The color index of a star indicates...
that the color of a black body takes as the blackbody temperature changes, is often shown in this standard chromaticity space. In the CIE XYZ color space...
and to check the colortemperature of the lighting. Color reference cards can also be used to assess light quality, as in the color rendering index, where...
Another important quality of color film stock in particular is its color balance, which is defined by the colortemperature at which it accurately records...
White is the lightest color and is achromatic (having no hue). It is the color of objects such as snow, chalk, and milk, and is the opposite of black....
capabilities and characteristics, such as its color gamut (range of colors it can display or reproduce) and colortemperature. These profiles are then used to translate...
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