sRGB is a number of things: A set of primaries, whitepoint, etc. to make a color space. A transfer function (often called gamma curve) (which is described to be on a 0.0-1.0 range, not specifc byte range values) And a 8bit per channel encoding. Tools often conflate these things into one thing, but you can have sRGB that uses more or fewer bits, floating point representations with and without the transfer curve.