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media: media/doc: improve bt.2020 documentation 

Add a note stating that bt.2020 is often used in combination with the
smpte 2084 transfer function.

Also use the right references to the documentation of that transfer
function.

Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2017-07-27 05:09:10 -04:00 committed by Mauro Carvalho Chehab
parent 5dcd7c66bc
commit fb98531e89
2 changed files with 6 additions and 1 deletions
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2
Documentation/media/uapi/v4l/colorspaces-defs.rst
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@ -97,7 +97,7 @@ whole range, 0-255, dividing the angular value by 1.41. The enum
* - ``V4L2_XFER_FUNC_DCI_P3``
- Use the DCI-P3 transfer function.
* - ``V4L2_XFER_FUNC_SMPTE2084``
- Use the SMPTE 2084 transfer function.
- Use the SMPTE 2084 transfer function. See :ref:`xf-smpte-2084`.

5
Documentation/media/uapi/v4l/colorspaces-details.rst
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@ -418,6 +418,11 @@ Inverse Transfer function:
L = \left( \frac{L' + 0.099}{1.099}\right) ^{\frac{1}{0.45} }\text{, for } L' \ge 0.081
Please note that while Rec. 709 is defined as the default transfer function
by the :ref:`itu2020` standard, in practice this colorspace is often used
with the :ref:`xf-smpte-2084`. In particular Ultra HD Blu-ray discs use
this combination.
The luminance (Y') and color difference (Cb and Cr) are obtained with
the following ``V4L2_YCBCR_ENC_BT2020`` encoding: