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The CIE 1931 xy chromaticity space, also showing the chromaticities of black-body light sources of various temperatures, and lines of constant correlated color temperature

Chromaticity is an objective specification of the quality of a color regardless of its luminance, that is, as determined by its hue and colorfulness (or saturation, chroma, intensity, or excitation purity).[1][2]

In color science, the white point of an illuminant or of a display is a neutral reference characterized by a chromaticity; for example, the white point of an sRGB display is an x, y chromaticity of [0.3127, 0.3290]. All other chromaticities may be defined in relation to this reference using polar coordinates. The hue is the angular component, and the purity is the radial component, normalized by the maximum radius for that hue.

## In color science

Purity is roughly equivalent to the term "saturation" in the HSV color model. The property "hue" is as used in general color theory and in specific color models such as HSV or HSL, though it is more perceptually uniform in color models such as Munsell, CIELAB or CIECAM02.

Some color spaces separate the three dimensions of color into one luminance dimension and a pair of chromaticity dimensions. For example, the chromaticity coordinates x and y are used in the xyY space, etc. These pairs define chromaticity vectors in a rectangular 2-space, unlike the polar coordinates of hue angle and saturation that are used in HSV color space.

On the other hand, some color spaces such as RGB and XYZ do not separate out chromaticity; chromaticity coordinates such as r and g or x and y can be calculated by an operation that normalizes out intensity.

The xyY space is a cross between the CIEXYZ and its normalized chromaticity coordinates xyz, such that the luminance Y is preserved and augmented with just the required two chromaticity dimensions.[3]

## References

1. ^ Emil Wolf (1961). Progress in Optics. North Holland Pub. Co.
2. ^ Leslie D. Stroebel, Richard D. Zakia (1993). The Focal Encyclopedia of Photography. Focal Press. ISBN 0-240-51417-3.
3. ^ Charles A. Poynton (2003). Digital Video and HDTV: Algorithms and Interfaces. Morgan Kaufmann. ISBN 1-55860-792-7.
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 Apple Patents Point to Advancing the Quality of iDevice Cameras Patently Apple Sat, 20 Apr 2013 14:28:39 -0700 More specifically, Apple's invention is for a novel chromaticity space that may be used as a framework to implement an auto-white balance solution or other color image processing solutions that take advantage of the particular properties of the novel ... Sharp LC-60LE650U PC Magazine Thu, 09 May 2013 11:11:45 -0700 After basic dark room calibration, the CIE chromaticity chart below shows red and blue landing just outside their corresponding boxes (inside the box is ideal, according to CIE standards) while green is off by a significant margin. As a result, there ... New Yorker Apple's iPhone Camera May Soon Get Even Better Wall St. Cheat Sheet Mon, 22 Apr 2013 04:55:29 -0700 The first patent, titled “Transformations and White Point Constraint Solutions for a Novel Chromaticity Space,” covers “techniques for creating a novel chromaticity space that may be used as a framework to perform color balancing on images captured by ... Nail Art Manufacturer Asia Nail Launches UV Lamp NAL Watch List News (press release) Mon, 13 May 2013 15:11:29 -0700 A wide range of brightness and color (color temperature and chromaticity) can be achieved by varying the type and pressure of the material injected into the glass tube, as well as the thickness and type of the phosphor used to coat the inner wall of ... Citizen announces v2 of its CoB LEDs ElectronicsWeekly.com Fri, 03 May 2013 09:13:46 -0700 “The new products are compliant with 3-Step MacAdam ellipses chromaticity control. Chromaticity variations of LEDs are rarely noticed, excluding the 5,000K, Ra65 type.” Mass production is scheduled to start in May 2013. Like another recently introduced ... Know Your Mobile iPhone 6 camera to feature advanced colour correction? Know Your Mobile Wed, 24 Apr 2013 01:42:35 -0700 The first patent relates to creating a Novel Chromaticity Space. It's a bit complicated, so Patently Apple has provided a graphic to help you understand. Figure 1 is how images are usually processed, figure to is how Apple will be doing it and figure 3 ... SENSOR+TEST: MAZeT Presents Embedded Color Measurement Systems ThomasNet Industrial News Room (press release) Mon, 06 May 2013 05:32:45 -0700 When it comes to sensor applications for LED light regulation, systems for multispectral LED light sources (n>3 e.g. RGBW), which are characterized by a high level of stability for the chromaticity coordinate over time and the working temperature range ... iOS Doc iPhone 6 , iPad 5 , And iPad Mini 2 Will Feature Improved Camera Modules iOS Doc Wed, 01 May 2013 04:42:16 -0700 What this is stands in the conversion of RGB Raw data into the so called “novel chromaticity space” and what is more important or more special here is that this step should be met prior to going on with the actions of balancing the color or even prior ...
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