CIE 1931 xy chromaticity diagram showing the gamut of the Adobe RGB color space and location of the primaries. The D65 white point is shown in the center.

The Adobe RGB color space is an RGB color space developed by Adobe Systems in 1998. It was designed to encompass most of the colors achievable on CMYK color printers, but by using RGB primary colors on a device such as the computer display. The Adobe RGB color space encompasses roughly 50% of the visible colors specified by the Lab color space, improving upon the gamut of the sRGB color space primarily in cyan-greens. Image File history File links Download high resolution version (1140x1260, 674 KB) Summary Created by me from Image:CIExy1931. ... Image File history File links Download high resolution version (1140x1260, 674 KB) Summary Created by me from Image:CIExy1931. ... A white point is one of a number of reference illuminants used in colorimetry which serve to define the color white. Depending on the application, different definitions of white are needed to give acceptable results. ... An RGB color space is any additive color space based on the RGB color model. ... Adobe Systems (pronounced a-DOE-bee IPA: ) (NASDAQ: ADBE) (LSE: ABS) is an American computer software company headquartered in San Jose, California, USA. Adobe was founded in December 1982[1] by John Warnock and Charles Geschke, who established the company after leaving Xerox PARC in order to develop and sell... Year 1998 (MCMXCVIII) was a common year starting on Thursday (link will display full 1998 Gregorian calendar). ... Cyan, magenta, yellow, and key (black) CMYK (or sometimes YMCK) is a subtractive color model used in color printing. ... For other uses, see Print. ... RGB redirects here. ... A computer display monitor, usually called simply a monitor, is a piece of electrical equipment which displays viewable images generated by a computer without producing a permanent record. ... A comparison of different color spaces. ... Without further qualification, Lab color space refers to that of Hunter (Richard S Hunter, JOSA, 38, p 661 (1948)), which is an Adams Chromatic Valance Space. ... In color reproduction, including computer graphics and photography, the gamut, or color gamut (pronounced ), is a certain complete subset of colors. ... CIE 1931 xy chromaticity diagram showing the gamut of the sRGB color space and location of the primaries. ...

Specification

In Adobe RGB, colors are specified as (R,G,B) triplets, where each of the R, G, and B components can have values between 0 and 1. When displayed on a monitor, the exact chromaticities of the white point (1,1,1), the black point (0,0,0), and the primaries [(1,0,0) etc.] are specified. Moreover, the luminance of the monitor should be 160 cd/m² at the white point, and 0.5557 cd/m² at the black point, which implies a contrast ratio of 287.9. The environment of the monitor is illuminated at 32 lx. Chromaticity is the quality of a color as determined by its purity and dominant wavelength. ... Luminance (also called luminosity) is a photometric measure of the density of luminous intensity in a given direction. ... Photopic (black) and scotopic [1] (green) luminosity functions. ... The lux (symbol: lx) is the SI derived unit of illuminance or illumination. ...

Like in sRGB, the RGB component values in Adobe RGB are not proportional to the luminances. Rather, a gamma of 2.2 is assumed, without the linear segment near zero that is present in sRGB. Example of CRT gamma correction Plot of the sRGB standard gamma-expansion nonlinearity (red), and its local gamma value, slope in log–log space (blue). ...

Other RGB Color Spaces

• Adobe Wide Gamut RGB color space
• sRGB color space
• Bruce RGB color space
• NTSC 1953 color space
• ProPhoto RGB color space
• Wide Gamut RGB color space
• Wide Gamut RGB Compensated color space

The Adobe Wide Gamut RGB color space is an RGB color space developed by Adobe Systems as an alternative to the standard sRGB color space. ... CIE 1931 xy chromaticity diagram showing the gamut of the sRGB color space and location of the primaries. ... NTSC is the analog television system in use in Canada, Japan, Mexico, the Philippines, South Korea, Taiwan, the United States, and some other countries, mostly in the Americas (see map). ... CIE 1931 xy chromaticity diagram showing the chromaticities enclosed by the ProPhoto RGB color space and location of the primaries. ...

References

• The AdobeRGB(1998) Specification, May 2005 (PDF)

External links

• Working Space Comparison: sRGB vs. Adobe RGB 1998
• Adobe Magazine discussion of the new format (PDF)
• Adobe RGB (1998) color image encoding