color space


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
Related to color space: color space conversion

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 ?
They accomplished this by multiplying likelihoods (obtained through the lookup table) of the intensity values belonging to pixel's channels in a given color space.
2, as determined by Comission Internationale de l'Eclairge (CIE) to designate pure color fidelity exceeding the limits of human vision, provides accurate 99% replication of the Adobe RGB color space.
RGB color space is usually accepted as nonappropriate for color image processing applications due to the three major drawbacks are: a) it is device dependent and excludes some visible colors, b) Perceptually non-uniform and distance metric will not represent the real differences between colors, c) difficult to find thresholds for RGB cube(Ravi Subban,et al.
Lab* is an independent color space which makes it a powerful tool.
In addition to the rainbow scheme, other color maps defined in the RGB color space also exhibit similar problems and have to be handled with care, because the RGB color space has some critical disadvantages (Rogowitz and Treinish 1998; Light and Bartlein 2004).
Unlike RGB and CMYK color space, CIELab color space is closer to the human vision.
Current approaches to conversion of pixels from RGB to HSV color space in C++ language rely in most cases on a code which uses conditional expressions preventing the C++ compiler to take advantage of instructions designed for parallel data processing.
CIELAB color space used a non-linear transformation of the tristimulus space to simplify the original ANLAB formula developed by Adams in 1942, which was widely used in the colorant industry.
This color space is suitable only for electronic displays but it is not appreciated by the HVS.
Entering the red-carpeted pavilion, Color Space visitors were "transported from the raucous fairgrounds to an oasis of beauty," says a company spokeswoman.
Ciba has introduced IRGAZIN[R] DPP Cosmoray[TM] Orange, a high performance orange diketo-pyrrolo-pyrrole (DPP) pigment that is designed to extend the attainable color space and enhance appearance and shade brightness.
The other two pigments are the newest additions to the Synergy line of proprietary pigments, which are created by optimizing organic and inorganic pigment chemistries around desired properties and are said to be economical alternatives to more costly pigments in the same color space.