ITU-R BT.1886 transfer function, standard for HDTV.
BT.1886 is a gamma 2.4 transfer function that applies a power-law relationship between the input signal and the output luminance, designed for the Rec. 709 (HDTV) standards.
Both its inputs and outputs are normalized to [0, 1], similar to TransferFunction.sRGB and TransferFunction.Gamma22 EOTFs.
For more information, refer to International Telecommunication Union's Reference document for BT.1886