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[[File:CIExy1931 AdobeRGB.png|325px|right|thumb|The [[CIE 1931 color space#CIE xy chromaticity diagram and the CIE xyY color space|CIE 1931 ''xy'' chromaticity diagram]] showing the primaries of the Adobe RGB (1998) color space. The [[CIE Standard Illuminant D65]] white point is shown in the center.]]
The '''Adobe RGB (1998) color space''' is an [[RGB color space]] developed by [[Adobe Systems|Adobe Systems, Inc.]] in 1998. It was designed to encompass most of the colors achievable on [[CMYK]] color [[color printing|printers]], but by using [[RGB color model|RGB]] [[primary color]]s on a device such as a [[computer display]].
==Historical background==
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[[File:CIExy1931 AdobeRGB vs sRGB.png|250px|right|thumb|A comparison of the Adobe RGB (1998) color space and sRGB color gamuts space within the CIE 1931 ''xy'' chromaticity diagram. The sRGB gamut is lacking in cyan-green hues.]]
sRGB is an RGB color space proposed by [[Hewlett-Packard|HP]] and [[Microsoft]] in 1996 to approximate the color gamut of the most common computer display devices. Since sRGB serves as a "best guess" metric for how another person's monitor produces color, it has become the standard color space for displaying images on the Internet. sRGB's color gamut encompasses just 35% of the visible colors specified by CIE, whereas Adobe RGB (1998) encompasses slightly more than 50% of all visible colors. Adobe RGB (1998) extends into richer [[cyan]]s and greens than does sRGB – for all levels of luminance. The two gamuts are often compared in mid-tone values (~50% luminance), but clear differences are evident in [[exposure (photography)#Blacks|shadows]] (~25% luminance) and [[exposure (photography)#Highlights|highlights]] (~75% luminance) as well. In fact, Adobe RGB (1998) expands its advantages to areas of intense orange, yellow, and [[magenta]] regions.<ref name
Although there is a significant difference between gamut ranges in the CIE ''xy'' chromaticity diagram, if the coordinates were to be transformed to fit on the [[CIELUV|CIE ''u′v′'' chromaticity diagram]], which illustrates the eye's perceived variance in hue more closely, the difference in the green region is far less exaggerated. Also, although Adobe RGB (1998) can ''theoretically'' represent a wider gamut of colors, the color space requires special software and a complex workflow in order to utilize its full range. Otherwise, the produced colors would be squeezed into a smaller range (making them appear duller) in order to match sRGB's more widely used gamut.
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==External links==
*[https://web.archive.org/web/20050505000309/http://www.adobe.com/products/adobemag/archive/pdfs/98auhtbf.pdf ''Adobe Magazine'' discussion of Photoshop 5.0’s new RGB working spaces]
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*[http://www.color.org/chardata/rgb/adobergb.xalter ICC Adobe RGB (1998) Encoding Characteristics]
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