colour.models.log_encoding_SLog#

Apply the Sony S-Log 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-Log non-linear data \(y\) is encoded as normalised code values.
in_reflection (bool) – Whether the light level \(x\) to a camera is reflection.

Returns:

Sony S-Log 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

[SonyCorporation12]

Examples

>>> log_encoding_SLog(0.18)
0.3849708...

The values of IRE and CV of S-Log2 @ISO800 table in [SonyCorporation12] are obtained as follows:

>>> x = np.array([0, 18, 90]) / 100
>>> np.around(log_encoding_SLog(x, 10, False) * 100).astype(np.int_)
array([ 3, 38, 65])
>>> np.around(log_encoding_SLog(x) * (2**10 - 1)).astype(np.int_)
array([ 90, 394, 636])

colour.models.log_encoding_SLog#

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