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 ?
Blending of colours in software Matlab during the creation of 3D picture is performed by assumption of red colour component of the point in the first picture from the corresponding point in the second picture.
The red lens filters green and blue colour component.
Some of these flavonoids also give the tomato cuticles a bright yellow cast - the colour component that is missing in the translucent pink skins of the mutants.
Quality of visualized images depends on the adjusting of schlieren apparatus, method of correction of unremoved deformations of the optical path of schlieren system and in case of colour images on the colour component of the image as well.
The signature vector consists of S=13 components (in case of colour images for each colour component (r, g, b) and greyscale, together S=52).
It means the colour is represented by 3 coordinates describing the ratio of the red, green and blue base colour component.
Think about ALL your colour components before you start tile shopping.
The firm asserted that the technology works by shooting video of a subject and calculating average values for the colour components (red/green/blue) in a certain area of the face for each frame.
Even heating of the different colour components was only considered to be feasible with this special heating system.
Using full spectrum colour lighting is very important for people who work in fluorescent lighting because it lacks important colour components and creates a distorted spectrum effect.
Enhanced visual effect contributes to enhance the contrast in the adequate colour components.