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Topic: Chromaticity


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In the News (Sat 25 May 19)

  
  CIE Color System
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.
One characteristic of the commonly used 1931 CIE Chromaticity Diagram that is evident even from this crude portrayal is that the green takes up far too much of the landscape compared to the number of visually different colors in the region.
hyperphysics.phy-astr.gsu.edu /hbase/vision/cie.html   (651 words)

  
 Fylde Scientific - Colour measurements   (Site not responding. Last check: 2007-10-21)
Of these the chromaticity values are most useful as they allow a colour to be represented graphically, thus providing a simple, visual tool for comparing the colours of a series of objects in a meaningful and quantitative manner.
Chromaticity measurements provide a simple, visual means of describing the colour of an object, reducing the data in a transmission or reflectance spectrum to just two values:
Chromaticity P and H values can be obtained for a coloured solution by measuring the transmission spectrum on a standard diode array spectrophotometer, such as
www.fseric.demon.co.uk /skills/colour.htm   (1590 words)

  
 Computational Vision Lab
The input neuron is set either to 0 indicating that an RGB of chromaticity rg is not present in the scene, or 1 indicating that rg is present.
To quantify error, the chromaticities of all the surfaces in the scene are corrected on the basis of each algorithm’s illumination estimate.
The difference between the true chromaticities under the standard illuminant and those estimated by the algorithm is measured by the RMS error taken over all surfaces in the scene.
www.cs.sfu.ca /%7Ecolour/research/colour-constancy.html   (2388 words)

  
 efg's Chromaticity Diagrams Lab Report   (Site not responding. Last check: 2007-10-21)
Often the MacAdam discrimination ellipses are plotted on the CIE uv uniform chromaticity diagram.
The chromaticity coordinates of the RGB phosphors define a Maxwell Triangle (or gamut) of the possible display colors for a CRT monitor.
Chromaticity diagrams from this program appeared in the June 2000 revision of the Finnish book, Insinöörin (AMK) fysiikka (Physics for Engineers), by Hannu Peltonen, Juha Perkkio, and Kari Vierinen and published by Lahden Teho-Opetus, Inc.
www.efg2.com /Lab/Graphics/Colors/Chromaticity.htm   (2161 words)

  
 CCs: introduction   (Site not responding. Last check: 2007-10-21)
Chromaticity coordinates are simply the ratio of the intensities of the three primary lights that appear identical to a series of monochromatic lights of equal energy traversing the visible spectrum
A diagram in which any one of the three chromaticity coordinates is plotted against any other is called a chromaticity diagram.
The CIE 1931 2-deg CMFs (CIE, 1932), however, were derived from the chromaticity coordinates of Wright (1928) and Guild (1931).
www-cvrl.ucsd.edu /database/text/intros/introccs.htm   (127 words)

  
 AmphiSoft "Shaman" filters (pro versions)   (Site not responding. Last check: 2007-10-21)
You probably think that "Luminocity only" and "Chromaticity only" apply modes introduced in full versions of "Shaman" plug-in filters are "just two more apply modes" and nothing more.
It is known that human eye sees the luminocity (brightness) way better compared to chromaticity (hue and saturation).
These modes are extremely useful for fixing bad video capture and images, scanned from the books or magazines - in the latter case, "Chromaticity only" allow to easily eliminate the most of ugly moire, and then remove the rest using very delicate techniques in "Luminocity only" mode.
photoshop.msk.ru /as/shamanespro.html   (297 words)

  
 International Commission on Illumination   (Site not responding. Last check: 2007-10-21)
The CIE's chromaticity diagram (shown below), developedin 1931, is still used as a standard reference for defining colours, and as a reference forother colour spaces.
This slice became the chromaticity diagram.Incidentally, this technique of converting a three-dimensional colour space to a combination of chromaticity and intensity isalso used in colour television.
The gamut of all visible colours on the CIE plot is a tongue-shaped orhorseshoe-shaped figure, with the curved edge corresponding to the colours of the visible spectrum and the straight edge (the purple line) corresponding to non-spectral shades of purple.
www.therfcc.org /international-commission-on-illumination-38398.html   (461 words)

  
 International Commission On Illumination   (Site not responding. Last check: 2007-10-21)
The CIE's chromaticity diagram (shown below), developed in 1931, is still used as a standard reference for defining colours, and as a reference for other colour spaces.
Incidentally, this technique of converting a three-dimensional colour space to a combination of chromaticity and intensity is also used in colour television.
The gamut of all visible colours on the CIE plot is a tongue-shaped or horseshoe-shaped figure, with the curved edge corresponding to the colours of the visible spectrum and the straight edge (the purple line) corresponding to non-spectral shades of purple.
www.wikiverse.org /international-commission-on-illumination   (569 words)

  
 Chromaticity   (Site not responding. Last check: 2007-10-21)
The dominant wavelength is commonly thought of as equivalent to the property " hue " as used in general color theory and in specific color model s such as HSV or HSL.
efg's Computer Lab: CIE Chromaticity Diagrams Demonstrate how to display a 1931 CIE chromaticity chart, as well as the transformations needed for the 1960 and 1976 charts.
Chromaticity Color Management Consultants Provides on-site training, color management implementation, device ICC ColorSync profiles and workflow consulting with Praxisoft, Monaco, ColorBlind, ProfileMaker and more for litho printing, prepress, publishing, photo imaging, large format output.
www.serebella.com /encyclopedia/article-Chromaticity.html   (199 words)

  
 What are chromaticity coordinates?   (Site not responding. Last check: 2007-10-21)
Chromaticity coordinates x, y, and z are derived by calculating the fractional components of the tristimulus values thus:
A plot of this type is referred to as a chromaticity diagram.
The use of chromaticity diagrams has not enabled three-dimensional data to be compressed into two-dimensional data.
www.colourware.co.uk /cpfaq/q3-20.htm   (226 words)

  
 Definition: chromaticity diagram   (Site not responding. Last check: 2007-10-21)
chromaticity diagram: A two-dimensional Cartesian plot that depicts the multidimensional subjective relationship among colors perceived by the normal human visual system (eyes and nervous system, including the brain) when additively stimulated by (two or more; usually three) discrete monochromatic visible sources (wavelengths).
Note: The familiar CIE chromaticity diagram depicts perceived colors plotted as a function of the normalized relative intensity of a defined red (increasingly red with increased "X", or abscissa, value) versus the normalized relative intensity of a defined green (increasingly green with increased "Y".
With respect to a given perceived color, as plotted on the chromaticity diagram, the normalized relative intensity of a defined blue at any point is obtained by adding the normalized relative intensities of the red and green, and subtracting the total from 1.
www.atis.org /tg2k/_chromaticity_diagram.html   (166 words)

  
 Journal of Vision - Visual segmentation based on the luminance and chromaticity statistics of natural scenes, by Fine ...
The luminance (brightness) and chromaticity (color) of surfaces in natural scenes have been shown to be relatively statistically independent.
We used the statistics of these luminance and chromatic differences to construct a Bayesian model that predicts whether or not two points within an image belong to the same surface.
We made the simplifying assumption that the joint distribution of luminance and chromatic differences given that both points fall on the same surface, p((dL, dRG, dBY)/same), is independent of the separation of the two points, i.e.
www.journalofvision.org /1/3/63   (381 words)

  
 Tony MacAlpine - fusion, neoclassical, shred, u-name-it, all-out axe! - "EER-MUSIC.com aka Eclectic Earwig Reviews ...
Chromaticity is almost like a fusion between neoclassical and jazz fusion and instrumental rock bringing stylistic elements from all.
Chromaticity continues on, exploring some unusual chromatic and boundary-stretching tonality that balances exploration and listener accessibility in a very tenuous fashion that pushes the edge of the envelope of what is digestible, but always stays within that limit.
Chromaticity is a solid effort from MacAlpine with themes that grow on you the more you listen to them.
www.eer-music.com /EER_music_reviews/Tony_MacAlpine.html   (540 words)

  
 Color Temperature   (Site not responding. Last check: 2007-10-21)
The color temperature or chromaticity of a lamp is usually described in terms of its color temperature or, more accurately, by its "X" and "Y" coordinates on the CIE Chromaticity Diagram.
Correlated color temperature is the temperature of a fl body whose chromaticity most nearly matches that of the light source.
Because the chromaticity of a "white" fluorescent lamp only approximates that of a fl body, correlated color temperature (CCT) is used.
tristate.apogee.net /lite/lflchro.asp   (206 words)

  
 CIE 1931 color space - Information
The chromaticity of a color was then specified by the two derived parameters x  and y  which are functions of all three tristimulus values X, Y, and Z: The figure on the right shows the related chromaticity diagram.
The gamut of all visible chromaticities on the CIE plot is the tongue-shaped or horseshoe-shaped figure shown in color.
In the figure on the right, the rg chromaticity coordinates are shown on the two axes in fl, along with the gamut of the 1931 standard observer.
www.logicjungle.com /wiki/CIE_1931_color_space   (3112 words)

  
 LightEmittingDiodes.org Chapter 17   (Site not responding. Last check: 2007-10-21)
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.
Location of LED light emission on the chromaticity diagram (adopted from Schubert and Miller, 1999).
www.ecse.rpi.edu /~schubert/Light-Emitting-Diodes-dot-org/chap17/chap17.htm   (257 words)

  
 FreeGamma.com - Lobster Droplet, Plug-In, Luminosity, Photoshop, Gamma
It allows for changes to Hue and Saturation to be made by most of the dialogue boxes in the Layers Adjustment Layer menu, the Sponge tool (desaturate mode) and all of the Brush tools.
The Chromaticity Set can be used in Calculations and Apply image to create new options not previously available.
The Chromaticity Set of layers is not a straight copy of the RGB channels of the flattened file.
www.freegamma.com /chromaticity.shtml   (375 words)

  
 Stiles & Burch 10-deg chromaticity coordinates   (Site not responding. Last check: 2007-10-21)
The chromaticity coordinates tabulated here are from Table 1(5.5.4) of Wyszecki and Stiles (1982).
The chromaticity coordinates calculated directly from the 10 deg CMFs also in Table 1(5.5.4) differ slightly from these values.
We suspect that these differences arise because Stiles and Burch calculated the chromaticity coordinates of Table 1(5.5.4) from CMFs of a higher precision than the ones tabulated in Table 1(5.5.4).
www-cvrl.ucsd.edu /database/text/ccs/sbcc10.htm   (114 words)

  
 Chromaticity   (Site not responding. Last check: 2007-10-21)
Color stimulus is measurable, and is defined by three numerical values in accordance with colormetric conventions set forth by CIE and DIN 5033 for any given illuminant.
The three parameters that define color are the chromaticity coordinates x and y for a given color locus F(x,y) in the CIE chromaticity diagram (shown below), and the standard tristimulus value Y (brightness).
The 1931 CIE chromaticity diagram for a standard observer at 2
www.newportlab.com /c_i_e.htm   (156 words)

  
 Real Primaries   (Site not responding. Last check: 2007-10-21)
The darker triangle shows the chromaticity chart of the primary phosphors used by most color displays.
Notice that the position of the three primaries in the chromaticity diagram is away from the boundary of the visual spectrum, which says that they are not monochromatic light.
Each phosphor produces a band of wavelength and as a result produces a color that is less saturated than the monochromatic color of the same hue.
www.cs.unc.edu /~majumder/color/node20.html   (310 words)

  
 Chromaticity coordinates
MacLeod-Boynton chromaticity coordinates based on the Stockman and Sharpe (2000) cone fundamentals
Stiles and Burch (1959) 10-deg, rgb chromaticity coordinates
Stiles and Burch (1955) 2-deg, rgb chromaticity coordinates
cvrl.ioo.ucl.ac.uk /ccs.htm   (40 words)

  
 CHROMATIC POLYNOMIALS AND CHROMATICITY OF GRAPHS
This is the first book to comprehensively cover chromatic polynomials of graphs.
Dividing the book into three main parts, the authors take readers from the rudiments of chromatic polynomials to more complex topics: the chromatic equivalence classes of graphs and the zeros and inequalities of chromatic polynomials.
The early material is well suited to a graduate level course while the latter parts will be an invaluable resource for postgraduate students and researchers in combinatorics and graph theory.
www.worldscibooks.com /mathematics/5814.html   (239 words)

  
 More Cross Platform Woes   (Site not responding. Last check: 2007-10-21)
It is easiest to discuss the effect using a diagram.Don't worry about what the numbers mean (they are color measurements, called chromaticity), concentrate on the shape.
PNG stores the chromaticity values - the position of the triangle corners, plus the white point - used by the source platform which created the image, in a standard place in the file which browsers, image viewers and authoring tools know how to read and adjust for.
Together with the gamma, which we discussed earlier, this permits automatic adjustment to get very close to the colors you would measure from the original image.
www.w3.org /Graphics/PNG/platform2.html   (441 words)

  
 PNG Specification: Color Tutorial
Chromaticity is an objective measurement of the color of an object, leaving aside the brightness information.
XYZ colors having the same chromaticity values will appear to have the same hue but can vary in absolute brightness.
The white point allows one to infer the relative brightnesses of the three phosphors, which isn't determined by their chromaticities alone.
www.libpng.org /pub/png/spec/1.2/PNG-ColorAppendix.html   (1407 words)

  
 Print on Demand: Chromaticity to Handle GMG Color Management Systems
GRAND RAPIDS, MI, July 14, 2004 ­- Chromaticity (Website), the recognized leader in professional services for color technology and color management, will now deliver technical support services and a dealer certification program for GMG's entire line of color management products.
In addition, Chromaticity will offer a dealer certification program to help insure that each dealer location representing GMG's products has a trained, certified installer.
Chromaticity Incorporated specializes in providing professional support services to the graphic arts and allied industries as it relates to technical color solutions and color management.
www.printondemand.com /MT/archives/003642.html   (546 words)

  
 COMBINED CHROMATICITY AND MUNSELL COLOR DIAGRAM   (Site not responding. Last check: 2007-10-21)
The Munsell Color System was developed early in the 20th Century and was renotated in the 1950's in an attempt to rationalize it in terms of more recent color investigations.
To prepare an overlay of the Munsell Color System onto the New Chromaticity Diagram, some assumption must be made about the chromatic content of at least one non-white "color" in the Munsell color space.
The easiest assumption would be to estimate the color in the yellow corresponding to 572 nm and or the blue-green corresponding to 494 nm.
www.4colorvision.com /files/chroma-munsell.htm   (462 words)

  
 This is Chromaticity Diagram Applet   (Site not responding. Last check: 2007-10-21)
This applet introduces the notions of chromaticity diagrams and color gamuts.
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 /%7Encs/color/a_chroma.html   (158 words)

  
 THE COLOUR GROUP OF GREAT BRITAIN   (Site not responding. Last check: 2007-10-21)
The CIE x-y chromaticity diagram in 250 colours (36K).
The CIE x-y chromaticity diagram in true colour.png format.(73K).
The CIE u'-v' chromaticity diagram in 250 colours (35K).
www.city.ac.uk /colourgroup/images.html   (136 words)

  
 Chromaticity Code
The coordinates x, y and z are called the chromaticity coordinates.
These are related to x_bar, y_bar and z_bar which are called the spectral tristimulus values (or color matching functions) chosen by the CIE for reasons of convenience in colorimetric computations.
NetPBM's ppmtogif can be found at c ftp://ftp.cs.ubc.ca/ftp/archive/netpbm/ c IMPLICIT REAL*8 (a-h,o-z) DIMENSION ICV(800,800,3), WXY(2,82) c c Chromaticity Coodinates (x and y) for wavelenghts in 5 nm c increments from 380 nm to 780 nm.
www.isc.tamu.edu /~astro/color/chromaticity.html   (179 words)

  
 CHROMATICITY DIAGRAM AS SEEN BY COLOR ABNORMALS
Using an accurately reproduced set of the following charts and the NEW CHROMATICITY DIAGRAM FOR RESEARCH (note the small version in the upper left), it is easy to compare the chromatic performance of the normal and abnormal subject.
Protanopes see a Chromaticity Diagram similar to that of the deutranopes except their vision fades to gray at wavelengths longer than 600 nm.
Tritanopes see a Chromaticity Diagram similar to that of the tetartanopes except their vision fades to gray at wavelengths shorter than 460 nm.
www.4colorvision.com /files/4colorabnorm.htm   (628 words)

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