colour.models.log_encoding_SLog3¶
- colour.models.log_encoding_SLog3(x: FloatingOrArrayLike, bit_depth: int = 10, out_normalised_code_value: bool = True, in_reflection: bool = True) FloatingOrNDArray [source]¶
Define the Sony S-Log3 log encoding curve / opto-electronic transfer function.
- Parameters
x (FloatingOrArrayLike) – 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 non-linear Sony S-Log3 data \(y\) is encoded as normalised code values.
in_reflection (bool) – Whether the light level \(x\) to a camera is reflection.
- Returns
Non-linear Sony S-Log3 data \(y\).
- Return type
Notes
Domain
Scale - Reference
Scale - 1
x
[0, 1]
[0, 1]
Range
Scale - Reference
Scale - 1
y
[0, 1]
[0, 1]
References
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])