colour.RGB_to_ICTCP

colour.RGB_to_ICTCP(RGB, L_p=10000)

Converts from ITU-R BT.2020 colourspace to \(IC_TC_P\) colour encoding.

Parameters

• RGB (array_like) – ITU-R BT.2020 colourspace array.

• L_p (numeric, optional) – Display peak luminance \(cd/m^2\) for SMPTE ST 2084:2014 non-linear encoding. This parameter should stay at its default \(10000 cd/m^2\) value for practical applications. It is exposed so that the definition can be used as a fitting function.

Returns

\(IC_TC_P\) colour encoding array.

Return type

ndarray

Warning

The underlying SMPTE ST 2084:2014 transfer function is an absolute transfer function.

Notes

• The underlying SMPTE ST 2084:2014 transfer function is an absolute transfer function, thus the domain and range values for the Reference and 1 scales are only indicative that the data is not affected by scale transformations. The effective domain of SMPTE ST 2084:2014 inverse electro-optical transfer function (EOTF / EOCF) is [0.0001, 10000].

Domain	Scale - Reference	Scale - 1
RGB	UN	UN

Range	Scale - Reference	Scale - 1
ICTCP	I : [0, 1] CT : [-1, 1] CP : [-1, 1]	I : [0, 1] CT : [-1, 1] CP : [-1, 1]

References

[], []

Examples

>>> RGB = np.array([0.45620519, 0.03081071, 0.04091952])
>>> RGB_to_ICTCP(RGB)  
array([ 0.0735136...,  0.0047525...,  0.0935159...])