colour.log_decoding_curve¶

colour.log_decoding_curve(value, curve='Cineon', **kwargs)[source]¶

Decodes \(R'G'B'\) video component signal value to linear-light values using given log curve.

Other Parameters:
Parameters:	value (numeric or array_like) – Value. curve (unicode, optional) – {‘ACEScc’, ‘ACEScct’, ‘ACESproxy’, ‘ALEXA Log C’, ‘Canon Log 2’, ‘Canon Log 3’, ‘Canon Log’, ‘Cineon’, ‘D-Log’, ‘ERIMM RGB’, ‘Filmic Pro 6’, ‘Log3G10’, ‘Log3G12’, ‘Panalog’, ‘PLog’, ‘Protune’, ‘REDLog’, ‘REDLogFilm’, ‘S-Log’, ‘S-Log2’, ‘S-Log3’, ‘T-Log’, ‘V-Log’, ‘ViperLog’}, Computation curve.
	EI (int, optional) – {`colour.models.log_decoding_ALEXALogC()`}, Ei. E_clip (numeric, optional) – {`colour.models.log_decoding_ERIMMRGB()`}, Maximum exposure limit. E_min (numeric, optional) – {`colour.models.log_decoding_ERIMMRGB()`}, Minimum exposure limit. I_max (numeric, optional) – {`colour.models.log_decoding_ERIMMRGB()`}, Maximum code value: 255, 4095 and 650535 for respectively 8-bit, 12-bit and 16-bit per channel. bit_depth (int, optional) – {`colour.models.log_decoding_ACESproxy()`, `colour.models.log_decoding_SLog()`, `colour.models.log_decoding_SLog2()`}, {8, 10, 12}, Bit depth used for conversion, ACESproxy uses {10, 12}. black_offset (numeric or array_like) – {`colour.models.log_decoding_Cineon()`, `colour.models.log_decoding_Panalog()`, `colour.models.log_decoding_REDLog()`, `colour.models.log_decoding_REDLogFilm()`}, Black offset. density_per_code_value (numeric or array_like) – {`colour.models.log_decoding_PivotedLog()`}, Density per code value. firmware (unicode, optional) – {`colour.models.log_decoding_ALEXALogC()`}, {‘SUP 3.x’, ‘SUP 2.x’}, Alexa firmware version. in_legal (bool, optional) – {`colour.models.log_decoding_SLog()`, `colour.models.log_decoding_SLog2()`, `colour.models.log_decoding_SLog3()`}, Whether the non-linear Sony S-Log, Sony S-Log2 or Sony S-Log3 data \(y\) is encoded in legal range. linear_reference (numeric or array_like) – {`colour.models.log_decoding_PivotedLog()`}, Linear reference. log_reference (numeric or array_like) – {`colour.models.log_decoding_PivotedLog()`}, Log reference. negative_gamma (numeric or array_like) – {`colour.models.log_decoding_PivotedLog()`}, Negative gamma. out_reflection (bool, optional) – {`colour.models.log_decoding_SLog()`, `colour.models.log_decoding_SLog2()`}, Whether the light level \(x\) to a camera is reflection. method (unicode, optional) – {`colour.models.log_decoding_ALEXALogC()`}, {‘Linear Scene Exposure Factor’, ‘Normalised Sensor Signal’}, Conversion method.
Returns:	Log value.
Return type:	numeric or ndarray

Examples

>>> log_decoding_curve(0.457319613085418)  # doctest: +ELLIPSIS
0.1...
>>> log_decoding_curve(0.413588402492442, curve='ACEScc')
... # doctest: +ELLIPSIS
0.1...
>>> log_decoding_curve(0.391006842619746, curve='PLog', log_reference=400)
... # doctest: +ELLIPSIS
0.1...
>>> log_decoding_curve(0.376512722254600, curve='S-Log')
... # doctest: +ELLIPSIS
0.1...