ITU-R BT.1886 is the reference EOTF of SDR-TV. It is a gamma 2.4 transfer function (a power law with a 2.4 exponent) considered as a satisfactory approximation of the response characteristic of CRT to electrical signal. It has been standardized by ITU in March 2011. It is used for Rec. 709 (HD-TV) and Rec. 2020 (UHD-TV).
Definition.
BT.1886 EOTF is as follows:
formula_1where
According to ITU, for a better match, formula_9 can be set to 0.1 for moderate black level settings (e.g. 0.1 cd/m2) or to 0 for lower black levels (e.g. 0.01 cd/m2).
An alternative EOTF has also been provided by ITU for the cases a more precise match of CRT characteristics is required.
References.
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