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.
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References in periodicals archive ?
Customers even get more colors than the standard DCI-P3 colorspace used for feature films.
The last presentation of the session was on ColorSpace and ColorDance from Zhongchao Special Security Technology (ZSST).
In fact, we discarded a dataset that was obtained in colorspace (it could not be analyzed using our computational pipeline), a dataset with a sudden drop in Phred quality (median Phred score = 2 for all positions > 16 in all samples), a dataset which contained only one single healthy tissue control sample, three datasets because all reads were shorter than 18 nt (multiple alignments on the genome did not allow specific identification of TTSa-RNAs), and six datasets in which abundant mRNA fragments with random size distribution were retrieved among sRNA-seq reads, suggesting that mRNA degradation does not allow proper identification of bona fide TTSa-RNAs.
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.
• Image distorted after saving in Jpeg format with CMYK colorspace
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).
Leonid, "Does colorspace transformation make any difference on skin detection?" in Proceedings of the 6th IEEE Workshop on Applications of Computer Vision (WACV '02), pp.
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.