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| author |   Hans Verkuil <hansverk@cisco.com> | 2017-07-27 05:09:10 -0400 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-08-08 06:08:50 -0400 |
| commit | fb98531e8916c65c1db0434b343d335574431843 (patch) | |
| tree | d1b67ed767e6b29ba684b72ee9458a26c5a7ff3b /Documentation | |
| parent | media: media/doc: rename and reorder pixfmt files (diff) | |
| download | linux-dev-fb98531e8916c65c1db0434b343d335574431843.tar.xz linux-dev-fb98531e8916c65c1db0434b343d335574431843.zip | |
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/media/uapi/v4l/colorspaces-defs.rst | 2 | ||||
| -rw-r--r-- | Documentation/media/uapi/v4l/colorspaces-details.rst | 5 |
2 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/media/uapi/v4l/colorspaces-defs.rst b/Documentation/media/uapi/v4l/colorspaces-defs.rst index 7ae7dcf73f63..e67ed1e0b3fa 100644 --- a/Documentation/media/uapi/v4l/colorspaces-defs.rst +++ b/Documentation/media/uapi/v4l/colorspaces-defs.rst @@ -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`. diff --git a/Documentation/media/uapi/v4l/colorspaces-details.rst b/Documentation/media/uapi/v4l/colorspaces-details.rst index 128b2acbe824..47d7d1915284 100644 --- a/Documentation/media/uapi/v4l/colorspaces-details.rst +++ b/Documentation/media/uapi/v4l/colorspaces-details.rst @@ -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: |