color space


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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 ?
Images are captured and/or displayed by most of the digital devices in RGB color space since it is an orthogonal color space and hence is hardware friendly.
For removing these disturbances, we convert WCE images into Lab color space and find that tissue of digestive tract shows commonly stronger color reflection in channel a than the color reflection in any disturbance, and the tissue has obvious difference in channel b with any disturbance.
Since the selection of color space plays the most important role in traffic light detection performance, past studies have explored all the possible options.
We have built two different classifiers for texture + RGB and texture + HSV color space.
Those global features are global color histograms in the following color channels: 3rd channel of the CIE-XYZ color space, 1st channel of the HSV color space, and 1st channel of the HLS color space.
Chaudhary, "Robust skin segmentation using color space switching," Pattern Recognition and Image Analysis, vol.
(1) Transform RGB to XYZ color space using the following formula (1):
The values of each one of the bands of the RGB color space were extracted for the calculation of the median.
HSV color space defines colors as hue, saturation and brightness, respectively.
A true color-critical professional display with integrated hardware calibration, shading hood, and 350-lux high luminance, BenQ SW2700PT was awarded for its precise 99% coverage of Adobe RGB color space, vivid high-contrast rendering of deep black levels, and comprehensive connectivity including Displayport, DVI, HDMI, USB 3.0, and even memory card reader and OSD controller.
Because CIE Lab (E illuminant) was shown to perform well in most of the cases as per analysis [18], this uncorrelated color space is also the choice of the algorithm implemented in the available framework.
To evaluate the segmentation performance of the Euclidian metric in the L*a*b color space we designed a system that generated synthetic color images, with its associated ground truth (GT), and evaluated the results with Receiver operating characteristics (ROC) curves [7].