Wide-gamut_RGB_color_space

Wide-gamut RGB color space

Wide-gamut RGB color space

Large gamut of color space developed by Adobe

The wide-gamut RGB color space (or Adobe Wide Gamut RGB) is an RGB color space developed by Adobe Systems, that offers a large gamut by using pure spectral primary colors.[1] It is able to store a wider range of color values than sRGB 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%[2] and sRGB covers only 35.9%.[3]

CIE 1931 xy chromaticity diagram showing the gamut of the wide-gamut RGB color space and location of the primaries. The D50 white point is shown in the center.

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.[4]

As with sRGB, the color component values in wide-gamut RGB are not proportional to the luminances. Similar to Adobe RGB, a gamma 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 of the primary colors and the white point are as follows:

More information Color, CIE x ...

References

  1. [1]
    Pascale, Danny. "A Review of RGB Color Spaces ...from xyY to R'G'B'" (PDF). Retrieved February 12, 2010.
  2. [2]
    Adobe RGB color space
  3. [3]
    Rec. 709
  4. [4]
    Rodney, Andrew. "The role of working spaces in Adobe applications" (PDF). Retrieved February 12, 2010.
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