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

"""
Recommendation ITU-R BT.709-6
=============================

Define the *Recommendation ITU-R BT.709-6* opto-electrical transfer function
(OETF) 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 __future__ import annotations

from colour.hints import ArrayLike, NDArrayFloat
from colour.models.rgb.transfer_functions import oetf_BT601, oetf_inverse_BT601

__author__ = "Colour Developers"
__copyright__ = "Copyright 2013 Colour Developers"
__license__ = "BSD-3-Clause - 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: ArrayLike) -> NDArrayFloat: """ Define *Recommendation ITU-R BT.709-6* opto-electronic transfer function (OETF). Parameters ---------- L *Luminance* :math:`L` of the image. Returns ------- :class:`numpy.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: ArrayLike) -> NDArrayFloat: """ Define *Recommendation ITU-R BT.709-6* inverse opto-electronic transfer function (OETF). Parameters ---------- V Electrical signal :math:`V`. Returns ------- :class:`numpy.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)