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 ?
Also included are colorspace conversion tools, creative primary and sector color grading tools, with grain and skintone enhancement, plus an Ultrascaler to support image resizing.
This ensures, that the entire available ColorSpace will be used with the maximum number of colors.
First, we used the voloverlap function to calculate the area of overlapping tetrahedral colorspace in both species.
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.
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).
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.
1 also enhances RED grading controls by including REDcolor2 and Adobe 1998 colorspace support, REDgamma2 gammaspace support, automatic camera metadata support for HFlip and VFlip, ganged adjustment of decode settings and support for saving RED metadata in stills for copy and paste.
SCRATCH enables mixing and matching of any camera format, resolution or colorspace (including ACES) on the same timeline - and play back in real-time.
AVX(TM)2 plug-in support for deep colorspace and advanced keyframing for Mac OS X systems -- offers full control over custom parameter curves and 16-bit rendering for preserving the full color space of effects for both native Avid and third-party effects.
OpenColorIO is our contribution to help provide a framework on which people can easily share colorspace transformations and apply it to any workflow consistently.