colour.models.log_encoding_SLog3#

Apply the Sony S-Log3 log encoding opto-electronic transfer function (OETF).

Parameters:

x (Annotated[_Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str], 1]) – Reflection or \(IRE / 100\) input light level \(x\) to a camera.
bit_depth (int) – Bit-depth used for conversion.
out_normalised_code_value (bool) – Whether the Sony S-Log3 non-linear data data \(y\) is encoded as normalised code values.
in_reflection (bool) – Whether the light level \(x\) to a camera is reflection.

Returns:

Sony S-Log3 non-linear encoded data \(y\).

Return type:

numpy.ndarray

Notes

Domain	Scale - Reference	Scale - 1
`x`	1	1

Range	Scale - Reference	Scale - 1
`y`	1	1

References

[SonyCorporationc]

Examples

>>> log_encoding_SLog3(0.18)
0.4105571...

The values of S-Log3 10bit code values (18%, 90%) table in [SonyCorporationc] are obtained as follows:

>>> x = np.array([0, 18, 90]) / 100
>>> np.around(log_encoding_SLog3(x, 10, False) * 100).astype(np.int_)
array([ 4, 41, 61])
>>> np.around(log_encoding_SLog3(x) * (2**10 - 1)).astype(np.int_)
array([ 95, 420, 598])

colour.models.log_encoding_SLog3#

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