sRGB color space

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The CIE-1931 -xy- chromaticity diagram shows the gamut of the sRGB color space and the position of the primary valences. In the middle of the D65 - white point

sRGB color space or standard RGB (red-green-blue) is an RGB color space .


The color space was created in 1996 through a cooperation between Hewlett-Packard and Microsoft Corporation and confirmed by W3C , Exif , Intel , Pantone , Corel and many other industry participants. It is also recognized in open source software such as GIMP and is used in both proprietary and open graphic formats such as PNG .

Color definition

Located in CIE xy chromaticity coordinates

  • Red at [0.64; 0.33]
  • Green at [0.30; 0.60]
  • Blue at [0.15; 0.06]
  • the D65 - white point at [0.3127; 0.3290].

All other color valences are formed by multiplying the primary valences with the values ​​given in the graphic and then adding them.

sRGB has been criticized for its inept placement of the primary valences. If one uses the indices on the interval [0; 1], it is impossible to display colors out of gamut (the triangle shown in the graphic), which are within the set of colors that are visible to humans. Nevertheless, the values ​​of the primary valences are less important than the luminance curve, so that an image can be reproduced as well as possible.


sRGB was developed for the CRT monitors of 1996. Many programs are based on the assumption that an 8-bit image file is displayed unchanged on an 8-bit / channel display buffer. It can therefore be assumed that almost every image file with 8  bits per channel is in sRGB. Other hardware such as LC monitors and color printers are also equipped with compensation circuits or software, although they do not automatically output an sRGB curve, so that in the end they follow the standard. However, this does not always apply to professional hardware.

There is a lot of discussion among users about suitable RGB color spaces. sRGB has been criticized in part for its small gamut; for example, some of the colors visible to the eye that can still be represented in CMYK, for example, can not be represented in sRGB . Image processing experts therefore usually prefer Adobe RGB or ECI-RGB .

See also

Web links

Commons : SRGB  - collection of images, videos and audio files