color space

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color space

A system for describing color numerically. Also known as a "color model," the most widely used color spaces are RGB for scanners, cameras and displays, CMYK for color printing and YUV for TV/video. Prior to the proliferation of electronic displays, which are all RGB, color spaces were developed that were closer to the way people think about color. For example, the CIE Lab model uses lightness (L) and values on red-green (a) and blue-yellow (b) axes, while HSB uses hue, saturation and brightness. See CIE Lab, HSB, HSL, RGB, sRGB, YUV, xvYCC and color space conversion.


HSB, CIE Lab, RGB and CMYK
All four color spaces in this Photoshop color picker relate to each other. Although numbers can be entered, users mostly move the vertical slider or point into the box to select a color. In this example, the R in RGB is selected, and moving the slider changes Red from 0 to 255 and all related values in the other color spaces at the same time.







A More Intuitive Model
In the 1970s, Alvy Ray Smith developed the HSB model for color selection. Changing red to pink by reducing saturation (S) is more intuitive than changing green and blue in RGB. For details, see HSB. For invaluable information about color spaces and computer graphics (CG) from one of the country's most distinguished experts, visit www.alvyray.com, and click Papers and CG.







Color Space Conversion
Since displays, printers and TV/video all use different color spaces, conversion between them is necessary and commonplace.
References in periodicals archive ?
Detecting skin in face recognition systems: A colour spaces study.
Comparison of three methods for classification of pizza topping using different colour space transformations.
The allowance relates to additional claims involving the use of colour spaces and broadens the scope of applicability of Finline's use of vectors and scalars in its "Impress" image compression algorithm.
Andrew Zador, Vice President of Technology, and inventor of the Impress technology said: "This second patent allows us to use our Impress wavelet compression in a variety of colour spaces and media.
In this paper the sRGB colour space was observed and compared to CMYK coated and uncoated paper colour space.
Measurements in printing and colour space used in graphic technologies in the context of colour definition, as well as the tolerance between two colours, are defined by CIE L*a*b* colour space (Zjakir, 2007).
When this model is associated with a precise description of how the components are to be interpreted, the resulting set of colours is called colour space (Ganesan et al.
The larger the gamut, the larger is the colour space.
This conversion was necessary, as CIE L*a*b* colour space is designed to approximate human vision (Ganesan et al.
Colour Space and Colour Profiles, Available from: http://dpbestflow.