iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

media: media/doc: improve bt.2020 documentation

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/media/uapi/v4l/colorspaces-defs.rst
View File

@ -97,7 +97,7 @@ whole range, 0-255, dividing the angular value by 1.41. The enum
* - ``V4L2_XFER_FUNC_DCI_P3`` * - ``V4L2_XFER_FUNC_DCI_P3``
- Use the DCI-P3 transfer function. - Use the DCI-P3 transfer function.
* - ``V4L2_XFER_FUNC_SMPTE2084`` * - ``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
View File

@ -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 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 luminance (Y') and color difference (Cb and Cr) are obtained with
the following ``V4L2_YCBCR_ENC_BT2020`` encoding: the following ``V4L2_YCBCR_ENC_BT2020`` encoding: