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.

In 1931 the International Commission on Illumination (CIE) published the CIE 1931 color spaces which define the relationship between the visible spectrum and the visual sensation of specific colors by human color vision.

May 8, 2022 · This article has a downloadable Excel Spreadsheet with tabular data for plotting the CIE 1931 horseshoe, the black body curve, and the 7-step quadrangles bins defined in ANSI C78.377. If you want to add MacAdam ellipses, see. https://luminusdevices.zendesk.com/hc/en-us/articles/6068482944781-Color-Science-Calculate-a-MacAdam-Ellipse-Table

The real black body radiation curve moves quickly through red, and ends up really glacially bogged down in blue. The points here start on the right at 1000 K using an interval of 250 K, and end on the left at 30000 K using 5000 K steps.

If a section of the 1931 CIE diagram containing the black body curve is enlarged, there can be an infinite number of chromaticity coordinates that could represent any correlated or apparent color temperature.

The Duv of a color point in a chromaticity coordinate system can be used to describe its distance from the black body curve. Duv can be approximated using just a pair of xy coordinates from CIE 1931. Use the formula below, or simply plug in the x and y values into our online calculator.

Below you will find the coordinates in both CIE 1931 xy and CIE 1976 u'v' for both the black body locus and daylight locus, listed by 10K and 1K CCT increments. Alternatively, an interactive calculator is also available here.

As a "black body" object increases in temperature, its color appears increasingly blue. The path that this takes, when plotted on the CIE 1931 xy coordinate plane, is called the black body curve or black body locus.

Download scientific diagram | The CIE 1931 color space chromaticity diagram with inserted black body curve (black line) and markers for colors of different wavelengths. from publication...

Black-body radiation is the thermal electromagnetic radiation within, or surrounding, a body in thermodynamic equilibrium with its environment, emitted by a black body (an idealized opaque, non-reflective body).