Chromaticity: Difference between revisions

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[[file:Chromaticity_Diagram_RGB.svg|thumb|Chromaticity Diagram RGB]] [[file:Chromaticity_Diagram_RGB.svg|thumb|Chromaticity Diagram RGB|left]] [[file:PlanckianLocus.png|thumb|PlanckianLocus]] [[file:3D_Chromaticity_Diagram_WideGamutRGB.svg|thumb|3D Chromaticity Diagram WideGamutRGB|left]] [[file:CIE_1976_UCS.png|thumb|CIE 1976 UCS]] '''Chromaticity''' is an objective specification of the quality of a color regardless of its luminance. Chromaticity is a two-dimensional representation of color, which is defined by its hue and saturation. It is often used in various fields such as [[color science]], [[digital imaging]], and [[color printing]].
 
{{DISPLAYTITLE:Chromaticity}}
{{Short description|The quality of a color regardless of its luminance}}
{{Use dmy dates|date=October 2023}}
{{Color}}
 
'''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 ==
== Definition ==
Chromaticity is typically represented in a chromaticity diagram, which is a graphical representation of colors. The most common chromaticity diagram is the [[CIE 1931 color space|CIE 1931 chromaticity diagram]], which was developed by the [[International Commission on Illumination]] (CIE). In this diagram, colors are represented by their [[x, y chromaticity coordinates]].
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 ==
== Chromaticity Coordinates ==
Chromaticity coordinates are a set of values that define a color's hue and saturation. These coordinates are derived from the [[tristimulus values]] of a color, which are the amounts of three primary colors needed to match the color. The most commonly used chromaticity coordinates are the CIE 1931 x, y 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 Diagram ==
:x = \frac{X}{X + Y + Z}
The chromaticity diagram is a two-dimensional plot that shows the chromaticity coordinates of colors. The diagram includes a horseshoe-shaped curve known as the [[spectral locus]], which represents the chromaticities of pure spectral colors. The area inside the spectral locus represents the chromaticities of all possible colors.
: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 ==
== Applications ==
Chromaticity is used in various applications, including:
Chromaticity is used in various applications, including:
 
* [[Colorimetry]]: The science of measuring colors and assigning them numerical values.
* [[Color calibration]]: Ensuring that colors are accurately represented on different devices.
* [[Display technology]]: Ensuring accurate color reproduction in devices such as [[monitors]], [[televisions]], and [[projectors]].
* [[Color matching]]: Matching colors in different materials or lighting conditions.
* [[Lighting design]]: Selecting light sources with specific chromaticity characteristics for aesthetic or functional purposes.
* [[Colorimetry]]: The science of measuring and describing color.


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


== See Also ==
== See Also ==
* [[CIE 1931 color space]]
* [[Color theory]]
* [[Color space]]
* [[Color science]]
* [[Color science]]
* [[Colorimetry]]
* [[Tristimulus values]]
* [[Spectral locus]]


== References ==
== References ==
{{Reflist}}
* {{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}}


== External Links ==
== External Links ==
{{Commons category|Chromaticity}}
* [https://www.cie.co.at/ CIE Official Website]
* [https://www.colour-science.org/ Colour Science]


[[Category:Color]]
[[Category:Color science]]
[[Category:Color space]]
[[Category:Color space]]
[[Category:Color science]]
[[Category:Lighting]]
[[Category:Color vision]]
[[Category:Display technology]]
 
== Chromaticity ==
{{color-stub}}
<gallery>
File:PlanckianLocus.png|Planckian Locus
File:SRGB_gamut_within_CIExyY_color_space_mesh.webm|sRGB Gamut within CIExyY Color Space Mesh
File:CIE_1976_UCS.png|CIE 1976 UCS
</gallery>

Latest revision as of 21:28, 23 February 2025


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[edit]

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[edit]

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[edit]

Chromaticity is used in various applications, including:

Related Concepts[edit]

  • 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.

See Also[edit]

References[edit]

  • 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[edit]

Chromaticity[edit]

  • Planckian Locus
    Planckian Locus
  • sRGB Gamut within CIExyY Color Space Mesh
    sRGB Gamut within CIExyY Color Space Mesh
  • CIE 1976 UCS
    CIE 1976 UCS
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