Chromaticity: Difference between revisions

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The quality of a color regardless of its luminance

Chromaticity is an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified as hue and saturation, or as x and y coordinates in the CIE 1931 color space.

Definition

Chromaticity is defined by the International Commission on Illumination (CIE) as the quality of a color as determined by its dominant or complementary wavelength and purity taken together. It is a part of the color appearance model that describes how colors are perceived by the human eye.

Chromaticity Coordinates

In the CIE 1931 color space, chromaticity is represented by the chromaticity coordinates (x, y). These coordinates are derived from the tristimulus values X, Y, and Z, which are calculated from the spectral power distribution of a light source. The x and y coordinates are calculated as follows:

x = \frac{X}{X + Y + Z}

y = \frac{Y}{X + Y + Z}

These coordinates are plotted on the CIE chromaticity diagram, which is a two-dimensional representation of color space.

Applications

Chromaticity is used in various applications, including:

Colorimetry: The science of measuring colors and assigning them numerical values.
Display technology: Ensuring accurate color reproduction in devices such as monitors, televisions, and projectors.
Lighting design: Selecting light sources with specific chromaticity characteristics for aesthetic or functional purposes.

Related Concepts

Color temperature: A measure of the color of light emitted by a source, expressed in Kelvin.
Gamut: The complete range or scope of colors that can be produced by a device or represented in a color space.
Metamerism: The phenomenon where colors appear the same under certain lighting conditions but different under others.

References

R. W. G.,

 The Reproduction of Colour, 
  
 Wiley-IS&T, 
 2004, 
  
  
 ISBN 978-0-470-02425-0,

International Commission on Illumination (CIE)(link). {{{website}}}.

Accessed 2023-10-01.

External Links

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-[[File:Chromaticity Diagram RGB.svg|thumb]] [[File:Chromaticity Diagram RGB.svg|thumb]] [[File:PlanckianLocus.png|thumb]] [[File:3D Chromaticity Diagram WideGamutRGB.svg|thumb]] {{DISPLAYTITLE:Chromaticity}}
-'''Chromaticity''' is a specification of the quality of a color regardless of its luminance. It is an objective measure of the hue and saturation of a color, which together define its chromaticity. Chromaticity is often represented in a two-dimensional space, where the coordinates are derived from the color's spectral properties.
+{{DISPLAYTITLE:Chromaticity}}
+{{Short description|The quality of a color regardless of its luminance}}
+{{Use dmy dates|date=October 2023}}
+{{Color}}
-==Definition==
+'''Chromaticity''' is an objective specification of the quality of a [[color]] regardless of its [[luminance]]. Chromaticity consists of two independent parameters, often specified as hue and saturation, or as x and y coordinates in the [[CIE 1931 color space]].
-Chromaticity is defined by two parameters:
-* '''Hue''': This is the aspect of color which is described by terms such as red, yellow, green, blue, etc. It is the dominant wavelength of the color.
+== Definition ==
-* '''Saturation''': This describes the intensity or purity of the color. A fully saturated color contains no white light.
+Chromaticity is defined by the [[International Commission on Illumination]] (CIE) as the quality of a color as determined by its dominant or complementary wavelength and purity taken together. It is a part of the [[color appearance model]] that describes how colors are perceived by the human eye.
-Chromaticity is often represented in a chromaticity diagram, such as the [[CIE 1931 color space|CIE 1931 chromaticity diagram]], which maps the chromaticity of colors in a two-dimensional space.
+== Chromaticity Coordinates ==
+In the [[CIE 1931 color space]], chromaticity is represented by the chromaticity coordinates (x, y). These coordinates are derived from the [[tristimulus values]] X, Y, and Z, which are calculated from the spectral power distribution of a light source. The x and y coordinates are calculated as follows:
-==Chromaticity Diagrams==
+:x = \frac{X}{X + Y + Z}
-Chromaticity diagrams are graphical representations of the chromaticity of colors. The most well-known chromaticity diagram is the [[CIE 1931 color space|CIE 1931 chromaticity diagram]], which uses the x and y coordinates to represent chromaticity.
+:y = \frac{Y}{X + Y + Z}
-===CIE 1931 Chromaticity Diagram===
+These coordinates are plotted on the [[CIE chromaticity diagram]], which is a two-dimensional representation of color space.
-The CIE 1931 chromaticity diagram is based on the [[CIE 1931 color space]], which was the first mathematically defined color space. In this diagram, the chromaticity of a color is represented by its x and y coordinates, which are derived from the color's tristimulus values (X, Y, Z).
-The diagram is a horseshoe-shaped plot, with the spectral colors (colors of a single wavelength) forming the curved boundary. The line connecting the ends of the horseshoe represents the purples, which are non-spectral colors.
+== Applications ==
+Chromaticity is used in various applications, including:
+* [[Colorimetry]]: The science of measuring colors and assigning them numerical values.
+* [[Display technology]]: Ensuring accurate color reproduction in devices such as [[monitors]], [[televisions]], and [[projectors]].
+* [[Lighting design]]: Selecting light sources with specific chromaticity characteristics for aesthetic or functional purposes.
-==Applications==
+== Related Concepts ==
-Chromaticity is used in various fields, including:
+* [[Color temperature]]: A measure of the color of light emitted by a source, expressed in [[Kelvin]].
+* [[Gamut]]: The complete range or scope of colors that can be produced by a device or represented in a color space.
+* [[Metamerism]]: The phenomenon where colors appear the same under certain lighting conditions but different under others.
-* '''Colorimetry''': The science of measuring colors and assigning them numerical values.
+== See Also ==
-* '''Display technology''': Ensuring accurate color reproduction in devices such as monitors and televisions.
+* [[Color theory]]
-* '''Lighting''': Designing lighting systems with specific color characteristics.
+* [[Color space]]
+* [[Color science]]
-==Mathematical Representation==
+== References ==
-Chromaticity can be mathematically represented using different color spaces, such as the [[CIE 1931 color space]], [[CIE 1976 (L*, a*, b*) color space|CIE 1976 (L*, a*, b*)]], and others. Each color space provides a different method for calculating chromaticity coordinates.
+* {{Cite book |last=Hunt |first=R. W. G. |title=The Reproduction of Colour |year=2004 |publisher=Wiley-IS&T |isbn=978-0-470-02425-0}}
+* {{Cite web |url=https://www.cie.co.at/ |title=International Commission on Illumination (CIE) |access-date=2023-10-01}}
-==Also see==
+== External Links ==
-* [[Color space]]
+* [https://www.cie.co.at/ CIE Official Website]
-* [[CIE 1931 color space]]
+* [https://www.colour-science.org/ Colour Science]
-* [[Colorimetry]]
-* [[Hue]]
-* [[Saturation (color theory)]]
-{{Color}}
 [[Category:Color science]]
-[[Category:Color theory]]
+[[Category:Color space]]
+[[Category:Lighting]]
+[[Category:Display technology]]