colour.models.log_encoding_SLog2¶
-
colour.models.
log_encoding_SLog2
(x, bit_depth=10, out_normalised_code_value=True, in_reflection=True, **kwargs)[source]¶ Defines the Sony S-Log2 log encoding curve / opto-electronic transfer function.
- Parameters
x (numeric or array_like) – Reflection or \(IRE / 100\) input light level \(x\) to a camera.
bit_depth (int, optional) – Bit depth used for conversion.
out_normalised_code_value (bool, optional) – Whether the non-linear Sony S-Log2 data \(y\) is encoded as normalised code values.
in_reflection (bool, optional) – Whether the light level \(x\) to a camera is reflection.
- Other Parameters
**kwargs (dict, optional) – Keywords arguments for deprecation management.
- Returns
Non-linear Sony S-Log2 data \(y\).
- Return type
numeric or ndarray
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_SLog2(0.18) 0.3395325...
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_SLog2(x, 10, False) * 100).astype(np.int) array([ 3, 32, 59]) >>> np.around(log_encoding_SLog2(x) * (2 ** 10 - 1)).astype(np.int) array([ 90, 347, 582])