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 ?
Operators can see the calculated L,a,b or Delta E values on an LCD display by selecting the required color-space calculation.
It can convert between different color-space systems, including XYZ; Yxz; L*a*b*; L*C*H; HVC Hunter L,a,b; W; WB; and Y1.
Together with Digital Photo Professional software, the Easy-PhotoPrint software is now capable of identifying color-space information automatically and transferring it accurately to the Canon i9900 photo printer.
Both scaler ICs use STMicroelectronics' Perfect Color technology, a programmable color-space converter supporting the new sRGB color standard, which allows for precise color matching from PC to projector.
The FLI 2000 also includes a number of color-space conversion matrices and can produce 10-bit digital YUV signals complying to SMPTE 259, CCIR 601, M II and BetaCam, as well as 10-bit RGB and 10-bit parallel D1 digital component video.
Among the added capabilities of Genuine Fractals Pro is support for the CMYK color-space model and emerging technologies like Hexachrome, in addition to Genuine Fractals' RGB mode.
AuraVision's VxP524 performs two-dimensional interpolated scaling, dual-level polyphase filtering, cropping, color adjustment and color-space conversion with full 24-bit resolution.
Another series of installations consisted of metal-frame bunk beds draped with colored veils, creating sensuous, diaphanous color-spaces.