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# Topic: Chromaticity diagram

 Color Glossary Chromaticity diagram A diagram that represents the unit plane (the plane defined by the equation X+Y+Z=1) in a tristimulus space. The chromaticity diagram is often used as a convenient approximation to a constant brightness plane in the tristimulus space. Chromaticity is often used as a convenient approximation to chromaticness, which is the hue and saturation of a color ignoring brightness. tigger.uic.edu /~hilbert/Glossary.html   (5536 words)

 This is Chromaticity Diagram Applet Below the diagram is a proportional mixer control, that enables you to additively mix colors of the gamut vertices in various proportions to produce a mixture. As you operate the mixer, the resulting color is displayed below the diagram as a solid rectangle and the color's position is indicated on the chromaticity diagram by the marker. An interesting property of the chromaticity diagram is that for any gamut (not only triangular) an additive mixture of the vertices' colors always lies inside the gamut. www.cs.rit.edu /~ncs/color/a_chroma.html   (158 words)

 International Commission on Illumination - Wikipedia, the free encyclopedia The diagram is a two-dimensional plot of colours of constant intensity based on the visual response of the CIE-1931 standard observer, which was determined by physiological measurements of human colour vision. Note that the chromaticity diagram is a tool to specify how the human eye will experience light with a given spectrum. The cut-offs at the short- and long-wavelength side of the diagram are chosen somewhat arbitrarily; the human eye can actually see light with wavelengths up to about 810 nm, but with a sensitivity that is many thousand times lower than for green light. en.wikipedia.org /wiki/International_Commission_on_Illumination   (528 words)

 Nat' Academies Press, Procedures for Testing Color Vision: Report of Working Group 41 (1981) A diagram called the x,y chromaticity diagram was devised by the Commission Internationale of Eclairage (CIE) based on the average color matches of many color-normal observers. Since the chromaticity diagram represents only color matches and not hues, the hue names added to the chart in Figure A-1 are provided for the convenience of those who are not familiar with the appearance of different wavelength regions of the spectrum. By associating the coordinates in the x,y chromaticity diagram with their usual series of color appearances to normal trichromats, we can describe approximately which colors are confused by the two types of dichromats. www.nap.edu /openbook/POD095/html/97.html   (3729 words)

 [No title]   (Site not responding. Last check: 2007-11-04) The chromatic discrimination of the green part of the lattice is represented by lines radiating from the point DG, which are in correspondence one to one with the ratios of the B and Y stimuli in the three component diagram BDGY. The chromatic discrimination of the red part of the lattice is represented by lines radiating from the point DR, which are in correspondence one to one with the ratios of the B and Y stimuli in the three component diagram BDRY. The chromatic discrimination of the blue part of the lattice is represented by lines radiating from the point TB, which are in correspondence one to one with the ratios of the R and G stimuli in the three component diagram GTBR. www.iscc.org /aic2001/abstracts/oral/Oleari.doc   (1133 words)

 How does the lighting industry measure color appearance? | Light Sources and Color | Lighting Answers | NLPIP Chromaticity - The dominant or complementary wavelength and purity aspects of the color taken together, or of the aspects specified by the chromaticity coordinates of the color taken together. Since it is known that the chromaticity of any light source can be determined by a linear combination of three primaries, it is possible to abandon the use of real primaries in favor of imaginary primaries that have some useful characteristics. Also plotted in the diagrams is the flbody locus, which represents the chromaticities of a flbody radiator source, heated to incandescence. www.lrc.rpi.edu /programs/nlpip/lightinganswers/lightsources/measure.asp   (1609 words)

 World Intellectual Property Organization   (Site not responding. Last check: 2007-11-04) 15 is a schematic illustration of a chromaticity diagram representing a color gamut of a 6-primary display in accordance with an exemplary embodiment of the invention. The exact chromaticity position selected for a given primary color within a respective sub-gamut region may be determined in accordance with specific system requirements, for example, the desired width of the color gamut in the chromaticity plane and the desired image brightness. 11 C is a schematic illustration of a chromaticity diagram representing a color gamut of a 5-primary display in accordance with an exemplary embodiment of the invention. www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/88203.031023&ELEMENT_SET=DECL   (10411 words)

 CIE Color System The diagram at left represents the the mapping of human color perception in terms of two CIE parameters x and y. The diagram at lower left is a rough rendering of the 1931 CIE colors on the chromaticity diagram. On the CIE chromaticity diagram at left, some annotation is made about the significance of different parts of the diagram. hyperphysics.phy-astr.gsu.edu /hbase/vision/cie.html   (651 words)

 1931 CIE Chromaticity Diagram CIE chromaticity diagram is a 2-D diagram in a 3-D (xyz) space, so the best way to present it is to draw it in the 3-D xyz space and allow it to be looked at from different angle. These diagrams are applets, so it may take a few seconds to draw on a slow computer, but it is accurate to the limits of the displaying monitor while keeping a small download file. These diagrams are based on 1931 2-degree CIE xyz color matching functions that remain international standards in both colorimetry and photometry. www.biyee.net /v/cie_diagrams/index.htm   (370 words)

 Mauro Boscarol - Each device is special case - the gamut Note that a RGB gamut in the CIE 1931 chromaticity diagram is represented with a triangle whose vertices are R, G and B. The RGB gamuts of two distinct monitors. Note that a CMYK gamut is represented, in the CIE 1931 chromaticity diagram, with a shape which is not a triangle (roughly spoken, it is a triangle with vertices in C, M, and Y and with rounded sides). The color gamut of a printer is different from that of a monitor, although both are subsets of the chromaticity diagram (i.e of the set of colors visible to the human eye). www.boscarol.com /pages/cms_eng/020-gamut.html   (799 words)

 Rational Model of the Human Mechanism of Color Discrimination The chromaticity of any color vector is uniquely determined by the position of its trace on the diagram. Chromaticities of real lights are bounded on the chromaticity diagram by the curve of spectral colors (locus) and by the line of purple colors joining the red and violet ends of the locus. This diagram has the important property that the apparent distinction between two lights is proportional to the distance between points representing them [2,12]. elena.tolkov.com /cones_web/cones.htm   (3396 words)

 Sigma Designs - Chromaticity Overview White Paper The diagram and underlying mathematics were updated in 1960 and 1976; however, the NTSC television system is based on the 1931 specifications. Note that luminance, or brightness information, is not included in the standard CIE 1931 chromaticity diagram, but is an axis that is orthogonal to the (x, y) plane. The chromaticities and reference white (CIE illuminate C) for the 1953 NTSC standard (and assumed by the ITU-R BT.601 equations) are: www.sigmadesigns.com /public/Support/chromaticity.html   (769 words)

 Luminance and Chromaticity   (Site not responding. Last check: 2007-11-04) Chromaticity diagrams show two of the three dimensions of color, the third being luminance. One of the most useful properties of chromaticity diagrams is their convenient representation of mixtures of two lights. Strictly speaking, chromaticities indicate which lights will match for the standard observer under the exact laboratory conditions that generated the data on which the system is based, given further assumptions about the mathematical properties of human color vision. colorusage.arc.nasa.gov /lum_and_chrom.php   (1743 words)

 efg's Chromaticity Diagrams Lab Report The advantage of the 1976 diagram is that the distance between points is now approximately proportional to the perceived color difference, something definitely not true in the 1931 diagram. SMPTE Gamut in 1960 CIE uv Chromaticity Diagram SMPTE Gamut in 1976 CIE u'v' Chromaticity Diagram www.efg2.com /Lab/Graphics/Colors/Chromaticity.htm   (2161 words)

 XenonDepot HID/Xenon Technology The two-dimensional colour (x,y) diagram is taken from the Yxy colour space, in which Y is the lightness (and is identical to the tristimulus value Y) and x and y are the chromaticity coordinates calculated from the tristimulus values XYZ. The CIE x,y chromaticity diagram for this colour space is shown. In this diagram, achromatic colours are toward the center of the diagram, and the chroma or saturation increases toward the edges. www.xenondepot.com /htec.php   (534 words)

 Chromaticity Diagram   (Site not responding. Last check: 2007-11-04) The interior and the boundary of the horse shoe shaped region represent all the visible chromaticity values. This diagram is very useful since this factors out the luminance and shows only the chrominance. When two colors are added together, the new color lies on the straight line joining the two original colors in the chromaticity diagram. www.cs.unc.edu /~majumder/color/node19.html   (671 words)

 Jeffrey Friedl’s Blog » Digital-Image Color Spaces, Page 5: Chromaticity Diagrams “Chromaticity” is color without regard to brightness; each point on the graph represents a specific spectrum (relative combination of visible wavelengths of light). This lack of perceptual uniformity across the plot is a common criticism of xy chromaticity diagrams (but that's an issue about the plot, not about the color spaces the plot is attempting to illustrate). The triangles are the range of chromaticities that the two color spaces can represent; keep in mind that the range of brightnesses across which those chromaticities can be encoded in the color space is not at all represented by this graph. regex.info /blog/photo-tech/color-spaces-page5   (1324 words)

 What is CD   (Site not responding. Last check: 2007-11-04) The chromaticity diagram is also used to define color gamuts, or color ranges, that show the effect of adding colors together. Because the Center of Gravity Law of color mixture holds for the diagram, all colors that are additive mixtures of the vertices of a gamut, are necessarily located inside the gamut. The diagram is thus useful to compare the gamuts of various color monitors, printers, slide films, and other hardcopy devices. www.cs.rit.edu /~ncs/color/t_chroma.html   (487 words)

 Color indication comparison method - Patent 4770534 providing a planar chromaticity diagram for the values other than brightness in which the values for the reference color are at the origin and the abscissa and ordinates of the diagram; In the diagrams of 2(a), 2(b), and 2(c), the points R.sub.1, G.sub.1, and B.sub.1 in FIG. The color of the reference sample is measured using a conventional colorimeter or the like to obtain three stimulus values X, Y, and Z of that color, and then the values L*, a*, and b* are calculated therefrom using conventional calculations. www.freepatentsonline.com /4770534.html   (2482 words)

 GCA_Color_Theory   (Site not responding. Last check: 2007-11-04) The closed line drawn on the chromaticity diagram is the spectrum locus, place of the monochromatic radiations, and of the purple shades, described by a straight segment. The chromaticities of these vectors are represented by points on the chromaticity diagram, whose centre of gravity is the centre of the ellipse and the ellipse defines a region, within which the 68% of vectors are and, therefore, the region represents a standard deviation in the operation of colour matching. The not uniformity of the chromatic scales on the CIE 31 diagram is evident: the ratio between the smallest semi-axis and the greatest semi-axis of whole set of ellipses is 1/30. www.fis.unipr.it /~fermi/PagInternet_English/GCA_Color_Theory.html   (3993 words)

 Lighting - Glossary   (Site not responding. Last check: 2007-11-04) Plane diagram showing the result of mixtures of color stimuli, each chromaticity being represented unambiguously by a single point on the diagram. The locus of points in a chromaticity diagram that represents chromaticities of the radiation of Planckian radiators at different temperatures. A two­dimensional diagram in which the coordinates are defined with the intention of making equal distances represent as nearly as possible equal steps of color discrimination for color stimuli of the same luminance throughout the diagram. mujweb.cz /www/famulights/lightgloss.htm   (5220 words)

 NEW CHROMATICITY DIAGRAM for RESEARCH The choice of purple or violet for the color to be associated with this terminus is primarily one of semantics. The diagram can also be used to define a variety of primary axes in color space based on the trichromatic idea of Young-Helmoltz. The CIE diagram is based on the erroneous assumption that animal vision employs the additive color principle. www.4colorvision.com /files/chromaticity.htm   (845 words)

 Ultimate AV: An Eye for Color Part 1 Fig.8: The 1931 CIE chromaticity diagram includes regions of different hues and the monochromatic colors along the curved spectrum locus. Brightness is not represented in the CIE diagram; it is assumed to be constant. Fig.9: By selecting any two spectral colors on the chromaticity diagram, any color on the connecting line can be generated by combining different intensities of the two selected colors. ultimateavmag.com /features/204eye/index2.html   (1946 words)

 LightEmittingDiodes.org Chapter 17   (Site not responding. Last check: 2007-11-04) 1931 CIE chromaticity diagram with areas attributed to distinct colors (adopted from Gage et al., 1977). CIE 1976 (u',v') uniform chromaticity diagram calculated using the CIE 1931 2° standard observer. Chromaticity diagram showing the determination of the dominant color and color purity of a light source with chromaticity coordinates (x, y) using the equal-energy locus (x = 1/3, y = 1/3) as the white-light reference. www.ecse.rpi.edu /~schubert/Light-Emitting-Diodes-dot-org/chap17/chap17.htm   (257 words)

 sciforums.com - CIE chromaticity diagram If anyone is interested but doesn't have enough info on the CIE chromaticity diagram, ask and I'll post whatever I was told in class. It has been a few years since I was up on that diagram and when I was it was for color television. The eye is more sensitive to red than blue and I forget the offset from the theoretical color triangle to a chromacity diagram but I seem to remember it is almost twice as much blue. www.sciforums.com /showthread.php?t=33648   (376 words)

 The usage of the CIE chromaticity diagram   (Site not responding. Last check: 2007-11-04) In principle, the CIE chromaticity diagram represents the color sensation of the human eye. But still, we have to remember that the CIE chromaticity diagram is not the full range of colors. Hence, colors like brown (which is an orange-red chromaticity of low luminance) does not appear. www.igd.fhg.de /~schnaide/Ideals/HQRasterImages/html/ColorBasics006.html   (145 words)

 CIE - D. L. MacAdam UCS diagrams are not actually colour-systems because they are not represented by colour standards and only cover a small area of colour space. The noticeability of colour differences was not considered — very little data was available — when the chromaticity diagram was devised and adopted. A chromaticity diagram that possessed such properties came to be called 'uniform'. www.colorsystem.com /projekte/engl/40mace.htm   (685 words)

 PHYS1330 Chromaticity As we will see, any one chromaticity may be perceived as a wide range of possible colors depending on circumstances. Any chromaticity lying on a straight line between two other chromaticities may be matched by a linear sum of those two chromaticities. Be able to place these color squares approximately on the CIE diagram (without a color background!). www.physics.utoledo.edu /~lsa/_color/21_chr.htm   (1359 words)

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