colour.models.log_encoding_FLog2#

Apply the Fujifilm F-Log2 log encoding opto-electronic transfer function (OETF).

Parameters:

in_r (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) – Linear reflection data \(in\).
bit_depth (int) – Bit-depth used for conversion.
out_normalised_code_value (bool) – Whether the Fujifilm F-Log2 non-linear data \(out\) is encoded as normalised code values.
in_reflection (bool) – Whether the light level \(in\) to a camera is reflection.
constants (Structure | None) – Fujifilm F-Log2 constants.

Returns:

Fujifilm F-Log2 non-linear encoded data \(out\).

Return type:

numpy.floating or numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`in_r`	1	1

Range	Scale - Reference	Scale - 1
`out_r`	1	1

References

[Fujifilm22b]

Examples

>>> log_encoding_FLog2(0.18)
0.3910072...

The values of 2-2. F-Log2 Code Value table in [Fujifilm22b] are obtained as follows:

>>> x = np.array([0, 18, 90]) / 100
>>> np.around(log_encoding_FLog2(x, 10, False) * 100, 1)
array([  3.5,  38.4,  57.8])
>>> np.around(log_encoding_FLog2(x) * (2**10 - 1)).astype(np.int_)
array([ 95, 400, 570])

colour.models.log_encoding_FLog2#

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