Standard RGB
SRGB chromaticity CIE1931.svg
sRGB colors situated at calculated position in CIE 1931 chromaticity diagram. Luminance set so that to avoid bright lines toward primaries' complementary colours.
Native name
  • Standard RGB
  • IEC 61966-2-1:1999
First publishedOctober 18, 1999 (1999-10-18)[1]
CommitteeTC/SC: TC 100/TA 2[1]
DomainColor space, color model
CIE 1931 xy chromaticity diagram showing the gamut of the sRGB color space (the triangle). The outer curved boundary is the spectral (or monochromatic) locus, with wavelengths shown in nanometers (labeled in blue). This image is drawn using sRGB, so colors outside the triangle cannot be accurately colored and have been interpolated. The D65 white point is shown in the center, and the Planckian locus is shown with color temperatures labeled in kelvins. D65 is not an ideal 6504-kelvin blackbody because it is based on atmospheric filtered daylight.

sRGB is a standard[2] RGB (red, green, blue) color space that HP and Microsoft created cooperatively in 1996 to use on monitors, printers, and the Web. It was subsequently standardized by the IEC as IEC 61966-2-1:1999.[1] Its predecessor NIF RGB was used in FlashPix and was almost the same.[3] It is often the "default" color space for images that contain no color space information, especially if the images' pixels are stored in 8-bit integers per color channel.

sRGB uses the ITU-R BT.709 primaries, the same as in studio monitors and HDTV,[4] a transfer function (gamma) typical of CRTs, and a viewing environment designed to match typical home and office viewing conditions. This specification allowed sRGB to be directly displayed on typical CRT monitors of the time, which greatly aided its acceptance. sYCC uses BT.601 YCbCr matrix to encode into extended-gamut space, negative R'G'B' values are decoded using extended transfer function.

  1. ^ a b c d "IEC 61966-2-1:1999". IEC Webstore. International Electrotechnical Commission. Retrieved 3 March 2017.
  2. ^ Cite error: The named reference orig_pub was invoked but never defined (see the help page).
  3. ^ "FlashPix Format Specification" (PDF).
  4. ^ Charles A. Poynton (2003). Digital Video and HDTV: Algorithms and Interfaces. Morgan Kaufmann. ISBN 1-55860-792-7.