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Planckian locus in the CIE 1931 chromaticity diagram. In physics and color science, the Planckian locus or black body locus is the path or locus that the color of an incandescent black body would take in a particular chromaticity space as the blackbody temperature changes.
A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The radiation emitted by a black body in thermal equilibrium with its environment is called black-body radiation. The name "black body" is given because it absorbs all colors of light.
These particles form a part of the black body spectrum, in addition to the electromagnetic radiation. [52] A black body at room temperature (23 °C (296 K; 73 °F)) radiates mostly in the infrared spectrum, which cannot be perceived by the human eye, [53] but can be sensed by some reptiles. As the object increases in temperature to about 500 ...
The table on the right shows how the radiation of a black body at this temperature is partitioned, and also how sunlight is partitioned for comparison. Also for comparison a planet modeled as a black body is shown, radiating at a nominal 288 K (15 °C) as a representative value of the Earth's highly variable temperature.
Therefore, in most cases the straight feature of the stellar locus can be described by Ballesteros' formula [2] deduced for pure blackbodies: = +, where A, B, C and D are the magnitudes of the stars measured through filters with central frequencies ν a, ν b, ν c and ν d respectively, and k is a constant depending on the central wavelength ...
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 ...
A black body is characterized by its temperature and emits light of a specific hue, which is referred to as color temperature. [ 3 ] [ 4 ] [ 5 ] In practice, light sources that approximate Planckian radiators, such as certain fluorescent or high-intensity discharge lamps, are assessed based on their CCT, which is the temperature of a Planckian ...
Relative spectral power distribution of illuminant D and a black body of the same correlated color temperature (in red), normalized about 560 nm. The D series of illuminants are designed to represent natural daylight and lie along the daylight locus. They are difficult to produce artificially, but are easy to characterize mathematically.