The wide-gamut RGB color space (or Adobe Wide Gamut RGB) is an
RGB color space developed by
Adobe Systems
Adobe Inc. ( ), originally called Adobe Systems Incorporated, is an American multinational computer software company incorporated in Delaware
and headquartered in San Jose, California. It has historically specialized in software for the crea ...
, that offers a large
gamut by using pure spectral
primary colors.
It is able to store a wider range of color values than
sRGB
sRGB is a standard RGB (red, green, blue) color space that HP and Microsoft created cooperatively in 1996 to use on monitors, printers, and the World Wide Web. It was subsequently standardized by the International Electrotechnical Commission ( ...
or
Adobe RGB color spaces. As a comparison, the wide-gamut RGB color space encompasses 77.6% of the visible colors specified by the
CIELAB color space, while the standard Adobe RGB color space covers just 52.1% and sRGB covers only 35.9%.
When working in color spaces with such a large gamut, it is recommended to work in 16-bit per channel color depth to avoid
posterization effects. This will occur more frequently in 8-bit per channel modes as the gradient steps are much larger.
As with sRGB, the color component values in wide-gamut RGB are not proportional to the luminances. Similar to Adobe RGB, a
gamma
Gamma (uppercase , lowercase ; ''gámma'') is the third letter of the Greek alphabet. In the system of Greek numerals it has a value of 3. In Ancient Greek, the letter gamma represented a voiced velar stop . In Modern Greek, this letter re ...
of 2.2 is assumed, without the linear segment near zero that is present in sRGB. The precise gamma value is 563/256, or 2.19921875.
The
white point corresponds to
D50.
The
chromaticities
Chromaticity is an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified as hue (h) and colorfulness (s), where the latter is alternatively called s ...
of the primary colors and the white point are as follows:
References
Color space
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