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 ?
The clusters are constructed further on by assigning each pixel color to one of them, based on the Euclidean distance from the cluster's centroid, in the established colorspace, a distance which has to be smaller than a pre-established threshold.
Yueping, "Moving objects detection based on HSV colorspace and Vibe algorithm," Computer Engineering and Applications, vol.
8226; Image distorted after saving in Jpeg format with CMYK colorspace
This means the switcher operator has incredible control over the cameras and not only can settings like focus and iris be remotely set with extreme accuracy, but the operator has full lift, gamma and gain controls in full YRGB colorspace just like a full color corrector.
Lacassagne, "Covariance Descriptor Multiple Object Tracking and Re-identification with Colorspace Evaluation," in Proc.
Driving Aming's pair of shows (and explicitly stated by the title of his second) were the libidinal possibilities of both painting and abstraction, from Carol Bove's peacock-feather grid (Untitled, 2012) and Tauba Auerbach's immaculately bound color-spectrum cube (RGB Colorspace Atlas, 2011) to Amy Sillman's carefully worked gestural surface (Feet, 2011).
In the CIE (Commission Internationale de L'Eclairage or International Commission on Illumination) colorspace, these reference color points make the largest triangle that can be inscribed in the color triangles of all the possible produced color sets.
To make it easier to analyze, the colorspace can be divided into 90-degree sections.
Dan Margulis' Photoshop Lab Color: The Canyon Conundrum And Other Adventures In The Most Powerful Colorspace (0321356780, $49.
Additionally, our fiber optic spectrometers and accessories can be configured for a variety of color and appearance measurements, and operated with software to calculate (XYZ), L*a*b* and other colorspace values.
JetSend also lacks specific support for explicit colorspace conversion, which could make it a powerful tool for (both local and long-distance) prepress and print proofing.