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Topic: CIE 1931 color space


  
  Color
Color (American English) or colour (Commonwealth English) is a sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view.
When producing a color print or painting a surface, the applied paint changes the surface; if the surface is then illuminated with white light (which consists of equal intensities of all visible wavelengths), the reflected light will have a spectrum corresponding to the desired color.
Structural color is a property of some surfaces that are scored with fine parallel lines, formed of many thin parallel layers, or otherwise composed of periodic microstructures on the scale of the color's wavelength, to make a diffraction grating.
www.cooldictionary.com /words/Color.wikipedia   (4809 words)

  
 CIE Color System   (Site not responding. Last check: 2007-09-30)
The colors which can be matched by combining a given set of three primary colors (such as the blue, green,a nd red of a color television screen) are represented on the chromaticity diagram by a triangle joining the coordinates for the three colors.
The spectral colors are distributed around the edge of the "color space" as shown, and that outline includes all of the perceived hues and provides a framework for investigating color.
The diagram at lower left is a rough rendering of the 1931 CIE colors on the chromaticity diagram.
hyperphysics.phy-astr.gsu.edu /hbase/vision/cie.html   (651 words)

  
 Reference.com/Encyclopedia/Dominant wavelength
In color science, the dominant wavelength and complementary wavelength are ways of describing non-spectral (polychromatic) light mixtures in terms of the spectral (monochromatic) light that evokes an identical perception of hue.
For the purposes of this geometrical discussion, an analogy may be observed between the horseshoe shaped CIE 1931 color space and a circular slice of HSV color space, where the CIE flat spectrum white point at (1/3,1/3) is analogous to the HSV white point at (0,0).
See CIE for the standard representation of color space, where the border is composed of a horseshoe curve representing the pure spectral colors, with a straight line completing the perimeter along the bottom and representing the mixtures of extreme red and blue/violet that give the pure purples.
www.reference.com /browse/wiki/Complementary_wavelength   (740 words)

  
 color : QuicklyFind Info   (Site not responding. Last check: 2007-09-30)
Examples of non-spectral colors are the achromatic colors (fl, gray and white) other colors such as pink or tan, and magenta.
When the eye shifts attention after viewing a color for some time, then the complementary of that color (the color opposite to it in the color wheel) is perceived by the eye for some time wherever it moves.
Note that the color experience of a given light mixture may vary with absolute luminosity, due to the fact that both rods and cones are active at once in the eye, with each having different color curves, and rods taking over gradually from cones as the brightness of the scene is reduced.
www.quicklyfind.com /info/color.htm   (3134 words)

  
 Lab color space Biography,info
CIE L*a*b* (CIELAB) is the most complete color model used conventionally to describe all the colors visible to the human eye.
CIE 1976 L*a*b* is based directly on the CIE 1931 XYZ color space as an attempt to linearize the perceptibility of color differences, using the color difference metric described by the MacAdam ellipse.
Coloring information is referred to the color of the white point of the system, subscript n.
www.danceage.com /biography/sdmc_Lab_color_space   (618 words)

  
 A Standard Default Color Space for the Internet - sRGB
For color to be reproduced in a predictable manner across different devices and materials, it has to be described in a way that is independent of the specific behavior of the mechanisms and materials used to produce it.
Color management is a term that describes a technology that translates the colors of an object (images, graphics or text) from their current color space to the color space of the output devices like monitors, printers,...
Since the image is in a known color space and the profile for that color space would ship with the OS and browser, this enables the end users to enjoy the benefits of color management without the overhead of larger files.
www.w3.org /Graphics/Color/sRGB.html   (6019 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.
Since it is impossible for a color monitor with RGB phosphors to display the full spectrum of colors of a true CIE diagram, the part that has negative x, y, or z values are displayed by adding white to them.
There are other color coordinate systems most of which are not any kind of transform of 1931 CIE system, so it is impossible to display diagrams of those system correctly on different monitors that are calibrated with 1931 CIE system.
www.biyee.net /v/cie_diagrams   (370 words)

  
 DOMINANT WAVELENGTH FACTS AND INFORMATION   (Site not responding. Last check: 2007-09-30)
On the CIE color coordinate space, a straight line drawn between the point for a given color and the point for the color of the illuminant can be extrapolated out so that it intersects the perimeter of the space in two points.
The psychological perception known as ''color'' is commonly thought of as a function of the power spectrum of light frequencies impinging on the photoreceptors of the retina.
The same argument applies to complementary colors; for many coordinates in the green area of CIE color space, no complementary wavelength exists, but there is a complementary pure purple.
www.easyleo.com /dominant_wavelength   (717 words)

  
 Color - Gurupedia   (Site not responding. Last check: 2007-09-30)
The Color table should not be interpreted as a definite list—the pure spectral colors form a continuous spectrum, and how it is divided into distinct colors is a matter of taste and culture; for example, Newton identified the seven colors red, orange, yellow, green, blue, indigo, and violet, remembered by many school children using
primary colors of red, green, and blue, each of which stimulates one of the three types of the eye's color receptors with as little stimulation as possible of the other two.
color names to slightly different parts of the spectrum, or have a different color ontology: for instance, the Japanese color aoi can be interpreted as meaning something between the Western color terms of "blue" and "green": green is regarded as a shade of aoi.
www.gurupedia.com /c/co/color.htm   (3732 words)

  
 Color Vision
The 1931 CIE color matching functions remain as the international standard used in color monitor manufacturing.
Confusion Lines are the lines in a color space such as CIE chromaticity diagram on which colors are not distinguishable to certain dichromat.
Color Vision Test is an online test based on Confusion Lines It tests different types of color vision deficiencies: tritanopia - blue blindness which is very rare, deuteranopia - green blindness, protanopia - red blindness.
www.biyee.net /v   (385 words)

  
 colorspace-faq -- FAQ about Color and Gamma   (Site not responding. Last check: 2007-09-30)
Color is the perceptual result of light in the visible region of the spectrum, having wavelengths in the region of 400 nm to 700 nm, incident upon the retina.
According to the CIE [1], hue is the attribute of a visual sensation according to which an area appears to be similar to one of the perceived colors, red, yellow, green and bue, or a combination of two of them.
The colors that can be mixed from a particular set of CMY primaries cannot be determined from the colors of the primaries themselves, but are also a function of the colors of the sets of combinations of the primaries.
www.faqs.org /faqs/graphics/colorspace-faq   (12951 words)

  
 cars - Color
The idea of linguistically determined color categories is often used as evidence for the Sapir-Whorf hypothesis (Language, Thought, and Reality (1956) by Benjamin Lee Whorf).
One could as well define a valid color space with an X sensitivity curve that has twice the amplitude.
The sensitivity curves in the CIE 1931 and 1964 xyz color space are scaled to have equal areas under the curves.
www.carluvers.com /cars/Color   (4806 words)

  
 [No title]   (Site not responding. Last check: 2007-09-30)
A problem with the CIE 1931 color system is that it does not give a direct way of estimating color differences.
The color is based on the fact that they cannot be both red and green, or blue and yellow at the same time.
In Hesselgren's Color Atlas, 507 standard colors are specified, arranged in planes of equal hue according to the lightness and saturation.
home.wanadoo.nl /paulschils/08.02.html   (234 words)

  
 Color : search word
:''For alternative meanings, see color (disambiguation).'' Color is an important part of the [[visual arts.]] Color (or colour in many regions) is a sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view.
Color is a psychophysical phenomenon that exists only in our minds.
CIE 1931 chromaticity diagram One of the first mathematically defined color spaces is the CIE XYZ color space (also known as CIE 1931 color space), created by the International Commission on Illumination in 1931.
www.searchword.org /co/color.html   (4666 words)

  
 What is CIE 1976 (L* a* b*) colour space?   (Site not responding. Last check: 2007-09-30)
There are perhaps two problems with the specification of colours in terms of tristimulus values and chromaticity space.
The need for a uniform colour space led to a number of non-linear transformations of the CIE 1931 XYZ space and finally resulted in the specification of one of these transformations as the CIE 1976 (L* a* b*) colour space.
In fact in 1976 the CIE specified two colour spaces; one of these was intended for use with self-luminous colours and the other was intended for use with surface colours.
www.colourware.co.uk /cpfaq/q3-21.htm   (312 words)

  
 Amber (color) - Psychology Central   (Site not responding. Last check: 2007-09-30)
It is famous for being a color used in traffic lights.
The color is defined in terms of the CIE 1931 color space as follows:
The entirety of this definition lies outside the gamut of the sRGB colour space — such a pure color cannot be represented using RGB primaries.
psychcentral.com /psypsych/Amber_(color)   (262 words)

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