sRGB transfer function, commonly used for Standard Dynamic Range (SDR) displays.
The sRGB transfer function is a piece-wise function that includes a linear segment near zero to handle low-intensity values smoothly, and a power-law segment for the remaining parts of the curve, to align with human visual perception.
Both its inputs and outputs are normalized to [0, 1], similar to TransferFunction.BT1886 and TransferFunction.Gamma22 EOTFs.
Unity uses this EOTF when the ColorGamut of the display is ColorGamut.sRGB or ColorGamut.DisplayP3.