color space

(redirected from Colour space)

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 ?
According to Adobe, the wide gamut colour space provides 25% more colour than the sRGB colour space ensuring more accurate edits in your photos.
Comparison of three methods for classification of pizza topping using different colour space transformations.
In this paper the sRGB colour space was observed and compared to CMYK coated and uncoated paper colour space.
Measurements in printing and colour space used in graphic technologies in the context of colour definition, as well as the tolerance between two colours, are defined by CIE L*a*b* colour space (Zjakir, 2007).
When this model is associated with a precise description of how the components are to be interpreted, the resulting set of colours is called colour space (Ganesan et al.
The option, which adds advanced animations and demanding compositing to 601's range of application areas, features YUV colour space as used in the video industry instead of the computer world's RGB colour space for uncompressed video.
Coordinates of device-dependent colour space determine how to make a colour but they don't say anything about how the final colour will look like.
Coordinates of device-independent colour space determine how final colour will look like, but they don't say anything about how to make a colour.
In the first step the transformation of a device-dependent colour values of device into the device independent colour space so-called Connection Space (PCS) is performed.
Sanchez-Perez, "Detecting skin in face recognition systems: A colour spaces study", Digital Signal Processing, vol.