colour.models.eotf_inverse_ST2084

colour.models.eotf_inverse_ST2084(C: ArrayLike, L_p: float = 10000, constants: Structure | None = None) → NDArrayFloat

Apply the SMPTE ST 2084:2014 perceptual quantizer (PQ) inverse electro-optical transfer function (EOTF).

Parameters:

• C (ArrayLike) – Target optical output \(C\) in \(cd/m^2\) of the ideal reference display.

• L_p (float) – System peak luminance in \(cd/m^2\). This parameter should remain at its default value of \(10000 cd/m^2\) for practical applications. It is exposed to enable the definition’s use as a fitting function.

• constants (Structure | None) – SMPTE ST 2084:2014 constants.

Returns:

Colour value abbreviated as \(N\), directly proportional to the encoded signal representation and not directly proportional to the optical output of a display device.

Return type:

numpy.ndarray

Warning

SMPTE ST 2084:2014 is an absolute transfer function.

Notes

• SMPTE ST 2084:2014 is an absolute transfer function; thus, the domain and range values for the Reference and 1 scales are only indicative that the data is not affected by scale transformations. The effective domain of the SMPTE ST 2084:2014 inverse electro-optical transfer function (EOTF) is [0.0001, 10000].

Domain	Scale - Reference	Scale - 1
C	UN	UN

Range	Scale - Reference	Scale - 1
N	UN	UN

References

[Mil14], [SocietyoMPaTEngineers14]

Examples

>>> eotf_inverse_ST2084(100)
0.5080784...