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[media] DocBook media: BT.2020 RGB uses limited quantization range

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In contrast to all other colorspaces, the BT.2020 colorspace uses
limited range R'G'B' quantization as the default.

This was incorrected documented, so fix this.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-03-08 04:53:31 -03:00 committed by Mauro Carvalho Chehab
parent f658d133ba
commit 1acb93ad3f
1 changed files with 6 additions and 5 deletions
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11
Documentation/DocBook/media/v4l/pixfmt.xml
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@ -483,8 +483,8 @@ is the Y'CbCr encoding identifier (&v4l2-ycbcr-encoding;) to specify non-standar
Y'CbCr encodings and the third is the quantization identifier (&v4l2-quantization;)
to specify non-standard quantization methods. Most of the time only the colorspace
field of &v4l2-pix-format; or &v4l2-pix-format-mplane; needs to be filled in. Note
that the default R'G'B' quantization is always full range for all colorspaces,
so this won't be mentioned explicitly for each colorspace description.</para>
that the default R'G'B' quantization is full range for all colorspaces except for
BT.2020 which uses limited range R'G'B' quantization.</para>
<table pgwide="1" frame="none" id="v4l2-colorspace">
<title>V4L2 Colorspaces</title>
@ -598,7 +598,8 @@ so this won't be mentioned explicitly for each colorspace description.</para>
<row>
<entry><constant>V4L2_QUANTIZATION_DEFAULT</constant></entry>
<entry>Use the default quantization encoding as defined by the colorspace.
This is always full range for R'G'B' and usually limited range for Y'CbCr.</entry>
This is always full range for R'G'B' (except for the BT.2020 colorspace) and usually
limited range for Y'CbCr.</entry>
</row>
<row>
<entry><constant>V4L2_QUANTIZATION_FULL_RANGE</constant></entry>
@ -967,8 +968,8 @@ SMPTE 170M/BT.601. The Y'CbCr quantization is limited range.</para>
<title id="col-bt2020">Colorspace BT.2020 (<constant>V4L2_COLORSPACE_BT2020</constant>)</title>
<para>The <xref linkend="itu2020" /> standard defines the colorspace used by Ultra-high definition
television (UHDTV). The default Y'CbCr encoding is <constant>V4L2_YCBCR_ENC_BT2020</constant>.
The default Y'CbCr quantization is limited range. The chromaticities of the primary colors and
the white reference are:</para>
The default R'G'B' quantization is limited range (!), and so is the default Y'CbCr quantization.
The chromaticities of the primary colors and the white reference are:</para>
<table frame="none">
<title>BT.2020 Chromaticities</title>
<tgroup cols="3" align="left">