Source code for colour.models.rgb.transfer_functions.itur_bt_709

# -*- coding: utf-8 -*-
"""
ITU-R BT.709-6
==============

Defines the *ITU-R BT.709-6* opto-electrical transfer function (OETF / OECF)
and its inverse:

-   :func:`colour.models.oetf_BT709`
-   :func:`colour.models.oetf_inverse_BT709`

References
----------
-   :cite:`InternationalTelecommunicationUnion2015i` : International
    Telecommunication Union. (2015). Recommendation ITU-R BT.709-6 - Parameter
    values for the HDTV standards for production and international programme
    exchange BT Series Broadcasting service (pp. 1-32).
    https://www.itu.int/dms_pubrec/itu-r/rec/bt/\
R-REC-BT.709-6-201506-I!!PDF-E.pdf
"""

from colour.models.rgb.transfer_functions import oetf_BT601, oetf_inverse_BT601

__author__ = 'Colour Developers'
__copyright__ = 'Copyright (C) 2013-2021 - Colour Developers'
__license__ = 'New BSD License - https://opensource.org/licenses/BSD-3-Clause'
__maintainer__ = 'Colour Developers'
__email__ = 'colour-developers@colour-science.org'
__status__ = 'Production'

__all__ = ['oetf_BT709', 'oetf_inverse_BT709']


[docs]def oetf_BT709(L): """ Defines *Recommendation ITU-R BT.709-6* opto-electronic transfer function (OETF / OECF). Parameters ---------- L : numeric or array_like *Luminance* :math:`L` of the image. Returns ------- numeric or ndarray Corresponding electrical signal :math:`V`. Notes ----- +------------+-----------------------+---------------+ | **Domain** | **Scale - Reference** | **Scale - 1** | +============+=======================+===============+ | ``L`` | [0, 1] | [0, 1] | +------------+-----------------------+---------------+ +------------+-----------------------+---------------+ | **Range** | **Scale - Reference** | **Scale - 1** | +============+=======================+===============+ | ``V`` | [0, 1] | [0, 1] | +------------+-----------------------+---------------+ References ---------- :cite:`InternationalTelecommunicationUnion2015i` Examples -------- >>> oetf_BT709(0.18) # doctest: +ELLIPSIS 0.4090077... """ return oetf_BT601(L)
[docs]def oetf_inverse_BT709(V): """ Defines *Recommendation ITU-R BT.709-6* inverse opto-electronic transfer function (OETF / OECF). Parameters ---------- V : numeric or array_like Electrical signal :math:`V`. Returns ------- numeric or ndarray Corresponding *luminance* :math:`L` of the image. Notes ----- +------------+-----------------------+---------------+ | **Domain** | **Scale - Reference** | **Scale - 1** | +============+=======================+===============+ | ``V`` | [0, 1] | [0, 1] | +------------+-----------------------+---------------+ +------------+-----------------------+---------------+ | **Range** | **Scale - Reference** | **Scale - 1** | +============+=======================+===============+ | ``L`` | [0, 1] | [0, 1] | +------------+-----------------------+---------------+ References ---------- :cite:`InternationalTelecommunicationUnion2015i` Examples -------- >>> oetf_inverse_BT709(0.409007728864150) # doctest: +ELLIPSIS 0.1... """ return oetf_inverse_BT601(V)