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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.
The Planckian locus on the MacAdam (u, v) chromaticity diagram. The normals are lines of equal correlated color temperature. The CIE 1960 color space ("CIE 1960 UCS", variously expanded Uniform Color Space, Uniform Color Scale, Uniform Chromaticity Scale, Uniform Chromaticity Space) is another name for the (u, v) chromaticity space devised by David MacAdam.
The solid curve with dots on it, through the middle, is the Planckian locus, with the dots corresponding to a few select black-body temperatures that are indicated just above the x-axis. Since the human eye has three types of color sensors that respond to different ranges of wavelengths, a full plot of all visible colors is a three-dimensional ...
The even spacing of the isotherms on the locus implies that the mired scale is a better measure of perceptual color difference than the temperature scale. The notion of using Planckian radiators as a yardstick against which to judge other light sources is not new. [6]
The Planckian locus is depicted on the CIE 1960 UCS, along with isotherms (lines of constant correlated color temperature) and representative illuminant coordinates By the time the D-series was formalized by the CIE, [ 12 ] a computation of the chromaticity ( x , y ) {\displaystyle (x,y)} for a particular isotherm was included. [ 13 ]
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 ...
Blacksmiths judge workpiece temperatures by the colour of the glow. [7] This blacksmith's colourchart stops at the melting temperature of steel. Black-body radiation has a characteristic, continuous frequency spectrum that depends only on the body's temperature, [8] called the Planck spectrum or Planck's law.
The biomedical model of medicine care is the medical model used in most Western healthcare settings, and is built from the perception that a state of health is defined purely in the absence of illness. [1]: 24, 26 The biomedical model contrasts with sociological theories of care. [1]: 1 [2]