SRGB

SRGB

SRGB is a standard RGB colour space created cooperatively by HP and Microsoft in 1996 for use on monitors, printers, and the Internet.

SRGB uses the ITU-R BT.709 primaries, the same as are used in studio monitors and HDTV and a transfer function (gamma curve) typical of CRTs. This specification allowed SRGB to be directly displayed on typical CRT monitors of the time, a factor that greatly aided its acceptance.

Unlike most other RGB colour spaces, the SRGB gamma cannot be expressed as a single numerical value. The overall gamma is approximately 2.2, consisting of a linear (gamma 1.0) section near black, and a non-linear section elsewhere involving a 2.4 exponent and a gamma (slope of log output versus log input) changing from 1.0 through about 2.3.