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	Planckian locus - Wikipedia, the free encyclopedia
		In Color theory, the Planckian locus is generally the path that the color of a fl body would take in a particular color space as the flbody temperature changes.
		Planckian locus in the (1964) CIE chromaticity diagram
		The Planckian locus in xy space is shown in the diagram on the left.
	en.wikipedia.org /wiki/Planckian_locus (298 words)

	Planckian locus Definition / Planckian locus Research (Site not responding. Last check: 2007-10-16)
		Planckian locus is the path that a fl body color will take through the diagram as the fl body temperature changes.
		Planckian locus is the region shown in Fig.
		Planckian locus is the curve formed by the chromaticities of different Planckian radiators in a colour space.
	www.elresearch.com /Planckian_locus (178 words)

	CONK! Encyclopedia: Color_temperature (Site not responding. Last check: 2007-10-16)
		The lines crossing the Planckian locus are lines of constant correlated color temperature.
		Since these lamps are very nearly fl body radiators, their chromaticity coordinates land directly on the Planckian locus in the CIExy color space.
		The method used is called the "correlated color temperature", which a method for assigning a color temperature to a color near, but not on, the Planckian locus.
	www.conk.com /search/encyclopedia.cgi?q=Color_temperature (1441 words)

	Lighting - Glossary (Site not responding. Last check: 2007-10-16)
		Locus of points on a surface at which the luminance is the same, for given positions of the observer and of the source or sources in relation to the surface.
		The locus of points in a chromaticity diagram that represents chromaticities of the radiation of Planckian radiators at different temperatures.
		Locus, in a chromaticity diagram or in a tristimulus space, of points that represent monochromatic stimuli.
	mujweb.cz /www/famulights/lightgloss.htm (5220 words)

	Encyclopedia: Planckian locus (Site not responding. Last check: 2007-10-16)
		In the arts of painting, and photography, color theory is a set of basic rules for mixing color to achieve a desired result.
		The fl body intensity is given by: In physics, the spectral intensity of electromagnetic radiation from a fl body at temperature T is given by the Plancks law of fl body radiation: where: I(ν) is the amount of energy per unit time per unit surface area per unit solid angle per unit frequency.
		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.
	www.nationmaster.com /encyclopedia/Planckian-locus (584 words)

	Ultimate AV: An Eye for Color Part 1
		The ends of the spectrum locus are connected by a diagonal line that represents the purples, which are combinations of red and blue.
		It is sometimes called the flbody or Planckian locus after the German physicist Max Planck (1858–1947), whose study of flbody radiation was instrumental in the development of quantum physics.
		There are also five points on or near the Planckian locus, labeled A, B, C, D, and E. These points represent different standard illumination sources (called reference illuminants) for photography and filming, as established by the CIE.
	www.guidetohometheater.com /features/204eye/index2.html (1956 words)

	Discussion and conclusions (Site not responding. Last check: 2007-10-16)
		This is due to the approximation of the illuminants by the Planckian locus.
		The illuminant chromaticity of the canonical light source is further from the Planckian locus than the other three light sources used in this paper.
		In outdoor applications the upper part of the Planckian locus (4000K - 25000K) can be replaced by a daylight locus [3].
	www.lia.auc.dk /~mst/Publications/fg2000html/node9.html (426 words)

	Color temperature
		The lines crossing the Planckian locus are lines of constant color temperature.
		The illumination they produce almost never plots, in color space, directly on the Planckian locus, as do all incandescent sources.
		The method used is called the "correlated color temperature", which a mathematical method of assigning a color temperature to a color near, but not on, the Planckian locus.
	www.arikah.com /encyclopedia/Color_temperature (1398 words)

	Skin locus from basis functions
		The basis functions for the Planckian colour signal set are smoother than for the artificial set, but this is to be expected due to their different forms of SPDs.
		Next, the basis functions are used to calculate the skin locus: first, the illuminants are chosen for the locus modelling and the number of the basis functions are selected to achieve the needed reconstruction accuracy.
		Here the mark ‘.’ shows calculated coefficients for different combinations of three Planckian illuminants (2300 K, 3400 K and 6500 K) and the linear relationship between the coefficients from one light source case is obvious.
	herkules.oulu.fi /isbn9514267885/html/i1030490.html (1362 words)

	United States Patent Application: 0030156425
		A Planckian or flbody radiator is a body that emits radiation, because of its temperature, according to Planck's law.
		True Planckian radiators are ideal abstractions, not practical sources, but many incandescent sources emit light whose spectral composition and color bears a close approximation thereto.
		[0092] The Planckian Locus is a curve on the u', v' diagram connecting the colors of the Planckian radiators at various temperatures, a large portion of which traverses the white, or achromatic region of the diagram.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20030156425".PGNR.&OS=DN/20030156425&RS=DN/20030156425 (16625 words)

	Modelling skin colour image formation
		In this paper only commonly used light sources are considered, which will be modelled by a Planckian locus of flbody radiators as recently proposed in [5].
		Given the light spectrum, the reflectance curves of skin, and the camera characteristics it is now possible to model the interface and body chromaticities of skin.
		Figure 2 is modelled for a camera that is white balanced at a 3700K flbody radiator.
	www.vision.auc.dk /~mst/Publications/fg2000html/node3.html (957 words)

	An overview of colour-based face image and skin analysis
		Colour temperature (Wyszecki & Stiles 2000) relates a light source or an illuminant to an ideal model called a Planckian radiator (also called a flbody radiator and a full radiator) and illustrates the relationship between the red and blue wavelength areas of the SPD.
		The Planckian radiator is a thermal radiator (hot body) with a continuous SPD depending only on the temperature of the body material.
		It defines uniquely the SPD of a Planckian radiator which presents a light emitted by an ideal flbody source when heated at this certain temperature.
	herkules.oulu.fi /isbn9514267885/html/c216.html (496 words)

	Illumination estimation using the Neutral Interface Reflection assumption
		Hence, the intersection of the Dichromatic line and the Planckian locus is an estimation of the illuminant chromaticity.
		It is reported in [5] that their method performs best with colours having a Dichromatic line approximately orthogonal to the Planckian locus such as greens, purples, and magentas.
		Thus a small deviation between the illuminant colour and the corresponding Planckian light source or a small error in the direction of the Eigenvector results in a large estimation error of the illuminant colour.
	www.vrmedialab.dk /~mst/Publications/fg2000html/node4.html (486 words)

	United States Patent Application: 0050030744
		The fixture of claim 60, wherein the fixture is adapted such that the spectrum of the combined output includes at least a portion of the Planckian locus ranging from approximately 2300 Kelvin to approximately 4500 Kelvin.
		The fixture of claim 61, wherein the fixture is adapted such that the spectrum of the combined output is substantially variable over the portion of the Planckian locus from approximately 2300 Kelvin to approximately 4500 Kelvin.
		1 is a chromaticity diagram in which Planckian locus (or fl body locus or white line) (104) gives the temperatures of whites from about 700 K (generally considered the first visible to the human eye) to essentially the terminal point.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20050030744".PGNR.&OS=DN/20050030744&RS=DN/20050030744 (18485 words)

	Physics Based Vision (Site not responding. Last check: 2007-10-16)
		Now suppose that we restrict illuminants to those which fall on the Planckian locus and consider an image of a single surface under some arbitrary illuminant.
		It follows that we can identify the scene illuminant by intersecting the line of image chromaticities with the Planckian locus thus defining a method for estimating a scene illuminant which relies only on a single surface.
		We would also like to relax the constraint that illuminants must lie on the Planckian locus and allow a wider range of non-Planckian lights to be considered.
	www.sys.uea.ac.uk /Research/groups/compvis/PhysicsBasedVision/PhysicsBasedVision.htm (2011 words)

	Color temperature (Site not responding. Last check: 2007-10-16)
		Because their CCT's plotted directly on the Planckian locus of the CIExy color model.
		Their spectral power distributions made them mathematically land on that curve in color space where all the "real" color temperatures are defined by Planck's Law, with no deviations.
		Say a lamp plotted up toward the greener region of color space, what they decided to do was simply draw a line straight down to the Planckian locus, and no matter how different the color was at that new point, that was how they rated their Correlated Color Temperature.
	www.worldhistory.com /wiki/C/Color-temperature.htm (773 words)

	Patent 4602188: Low-pressure mercury vapor discharge lamp
		White radiation is found in the colour triangle at colour points located on the Planckian locus.
		Of the side of the colour triangle itself, on which the colour points of monochromatic radiation are located, only the part designated by M is visible in FIG.
		1 shows for colour temperatures of approximately 2500 to 8000 K. the Planckian locus indicated by P. The dotted curves indicated by +20 MPCD and -20 MPCD comprise the colour points of radiation which are located at a distance of 20 MPCD above and below the curve P, respectively.
	www.freepatentsonline.com /4602188.html (4988 words)

	Patent 5854533: Fluorescent lamps with high color-rendering and high brightness
		All commercial sources for general-illumination purposes are located on, or in the vicinity of, the planckian locus.
		The methodology to be discussed is applicable in all generality to sources whose color point falls on the planckian locus, or in its vicinity, but here only the results for about 4,000K sources will be reported.
		The color point of the metameric mix, indicated in the Figure as MM, is seen to fall nicely on the Planckian (fl-body) locus.
	www.freepatentsonline.com /5854533.html (6983 words)

	P3D Color temperature
		C.S. McCamy's approximation for correlated color temperature for use between 2000K and 10000K is CCT = 437 n^3 + 3601 n^2 + 6831 n + 5517, where n = (x - 0.3320) / (0.1858 - y), and x and y are from the 1931 CIE color coordinates.
		It is noted in other references that the concept of color temperature is essentially meaningless except when the color in question is near the Planckian locus (the curve made up of fl body color points).
		In other words, the concept of color temperature is highly unproductive for many of the things 3D photographers would be interested in, and misuse of the concept causes harm by spreading misinformation.
	www.pauck.de /archive/mailinglist/photo-3d/mhonarc/msg23242.html (205 words)

	Rob Galbraith Digital Photography Insights: ACR critique 1 (Site not responding. Last check: 2007-10-16)
		According to some early reports when ACR was first conceived, the TEMP slider follows the planckian locus, and the TINT slider follows the iso-temperature lines.
		And it only is meant for colors that are close to the planckian locus.
		go from daylight-equivalent to an arbitrary tint which may not be close to the planckian locus at all...
	forums.robgalbraith.com /showflat.php?Cat=&Number=332840 (2155 words)

	MSN Encarta - Search Results - Planckian locus
		Locus (Latin for "place"), in mathematics, traditionally the path traced out by a moving point, but now defined as the set of all points on a curve...
		Locus Standi (Latin for "place to stand"), in law, the right to bring an action.
		Exclusively for MSN Encarta Premium Subscribers--quickly search thousands of articles from magazines such as Time, Newsweek, The Atlantic Monthly, and Smithsonian.
	encarta.msn.com /encnet/refpages/search.aspx?q=Planckian+locus (116 words)

	Colorimetry
		Incandescent sources that emit radiation with 100% efficiency are called "Black Body Radiators" or Planckian Sources.
		An ideal fl body glows with a color that is solely dependent on the object's temperature (in ºK - Kelvin) and therefore, its temperature can be used as a color standard.
		On the CIE chart (figure 2), the chromaticities of fl bodies at different temperatures fall on the Planckian locus.
	www.ledproductstore.com /colorimetry.htm (665 words)

	LightEmittingDiodes.org Chapter 18 (Site not responding. Last check: 2007-10-16)
		Chromaticity diagram showing planckian locus, the standardized white Illuminants A, B, C, D65, and E, and their color temperature (after CIE, 1978).
		CIE 1976 (u', v') uniform chromaticity diagram calculated using the CIE 1931 2° standard observer and planckian locus.
		Whereas the correleted color temperature follows from the minimum distance to the planckian in the (u’, v’) diagram, this is not the case in the (x,y) diagram (after Duggal, 2004).
	www.ecse.rpi.edu /~schubert/Light-Emitting-Diodes-dot-org/chap18/chap18.htm (141 words)

	High Brightness LEDs for Lighting (February 2001) - Compound Semiconductor magazine - Compound Semiconductor (Site not responding. Last check: 2007-10-16)
		The Planckian Locus traces the chromaticity coordinates of a flbody radiator at temperatures in the 100020,000K range.
		A typical incandescent lamp has a color temperature of around 2850K, and the typical color of daylight is 6500Kmost white lamps fall between these color temperatures.
		Any shift of color temperature along the Planckian Locus is usually acceptable depending on the application; shifts away from the Planckian Locus are often unacceptable.
	www.compoundsemiconductor.org /magazine/article/7/2/6/1 (2888 words)

	Color temp puzzle (Site not responding. Last check: 2007-10-16)
		As John Sprung pointed out as well as implied by J Hardis, the spectral distribution is known on things that glow.
		Indeed the CIE uses the Planckian radiator to create that shade of white we see on the diagram and it conveys how the peakpoint (dominant wavelength) on the glowing object moves along as its temperature increases, hence colour temperature.
		Sources that emit light like a flourescent do this by excitation of electrons that when falling back into their resting levels then give back the energy in the form of some light.
	tig.colorist.org /archives/public/oldtig-mhonarc/1998/msg01236.html (294 words)

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