colour.TRANSFER_CHARACTERISTICS_ITUTH273#

colour.TRANSFER_CHARACTERISTICS_ITUTH273 = {0: <function _reserved>, 1: <function oetf_BT709>, 2: <function _unspecified>, 3: <function _reserved>, 4: <function _clipped_domain_function.<locals>.wrapped>, 5: <function _clipped_domain_function.<locals>.wrapped>, 6: <function oetf_BT601>, 7: <function oetf_SMPTE240M>, 8: <function linear_function>, 9: <function oetf_H273_Log>, 10: <function oetf_H273_LogSqrt>, 11: <function oetf_H273_IEC61966_2>, 12: <function oetf_BT1361>, 13: <function oetf_H273_IEC61966_2>, 14: <function _clipped_domain_function.<locals>.wrapped>, 15: <function _clipped_domain_function.<locals>.wrapped>, 16: <function eotf_inverse_ST2084>, 17: <function eotf_inverse_H273_ST428_1>, 18: <function oetf_BT2100_HLG>, 19: <function _reserved>}#

TransferCharacteristics, as specified in Table 3 of [InternationalOfStandardization21] and [InternationalTUnion21], either indicates the reference opto-electronic transfer characteristic function of the source picture as a function of a source input linear optical intensity input Lc with a nominal real-valued range of 0 to 1 or indicates the inverse of the reference electro-optical transfer characteristic function as a function of an output linear optical intensity Lo with a nominal real-valued range of 0 to 1.

Notes

  • For simplicity, no clipping is implemented for TransferCharacteristics 13 as it is a function of whether the context is sRGB or sYCC.

  • For TransferCharacteristics equal to 18, the equations given in Table 3 are normalized for a source input linear optical intensity Lc with a nominal real-valued range of 0 to 1. An alternative scaling that is mathematically equivalent is used in ARIB STD-B67 (2015) with the source input linear optical intensity having a nominal real-valued range of 0 to 12.

References

[InternationalOfStandardization13] [InternationalOfStandardization20] [InternationalOfStandardization21], [InternationalTUnion21]