In Color theory, the Planckian locus is generally the path that the color of a black body would take in a particular color space as the blackbody temperature changes. Generally, a color space is a set of three numbers (e.g. X, Y, and Z) which specify the color and brightness of a particular homogeneous visual stimulus. Sometimes we may only wish to deal with the chromaticity (color) of a visual stimulus. This is a two-dimensional space of two numbers (e.g. x and y) which leave out the brightness information. In this case the Planckian locus is the path that the color of a black body takes in this chromaticity space as the blackbody temperature changes. In the arts of painting, and photography, color theory is a set of basic rules for mixing color to achieve a desired result. ... A color model is an abstract mathematical model describing the way colors can be represented as tuples of numbers, typically as three or four values or color components (e. ...

Example: The Planckian locus in CIE XYZ space

CIE (http://www.cie.co.at/framepublications.html)1964 Supplementary Standard Colorimetric Observer functions X, Y, and Z functions between 380 nm and 780 nm (at 5 nm intervals).

In the CIE XYZ color space, the three coordinates defining a color are given by X, Y, and Z where: Download high resolution version (1300x975, 144 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (1300x975, 144 KB) Wikipedia does not have an article with this exact name. ... Color is an important part of the visual arts. ...

where I(λ) is the spectral intensity of the light being viewed, and X(λ), Y(λ) and Z(λ) are the CIE standard observer functions shown in the diagram on the right, and λ is the wavelength. The Planckian locus is determined by substituting the Black body intensity into the above equations. The black body intensity is given by: In physics, the spectral intensity of electromagnetic radiation from a black body at temperature T is given by the Plancks law of black body radiation: where: I(ν) is the amount of energy per unit time per unit surface area per unit solid angle per unit frequency. ...

where:

T is the temperature of the black body

h is Planck's constant,:

c is the speed of light

k is Boltzmann's constant.

Planckian locus in the (1964) CIE chromaticity diagram

This will give the Planckian locus in XYZ space. If these coordinates are X(T), Y(T), Z(T) where T is the temperature, then In the CIE chromaticity coordinates will be Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... Plancks constant, denoted h, is a physical constant that is used to describe the sizes of quanta. ... Cherenkov effect in a swimming pool nuclear reactor. ... The Boltzmann constant (k or kB) is the physical constant relating temperature to energy. ... Download high resolution version (1300x1462, 524 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (1300x1462, 524 KB) Wikipedia does not have an article with this exact name. ... Color is an important part of the visual arts. ...

The Planckian locus in xy space is shown in the diagram on the left.