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author | Hans Verkuil <hans.verkuil@cisco.com> | 2015-03-08 04:53:30 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-04-02 18:10:54 -0300 |
commit | f658d133ba40af54b167a69b149a78bd966fa269 (patch) | |
tree | 2ae764627d6e02bacf783b64d7c00945ab635079 /Documentation/DocBook | |
parent | 1e8faa5945155ee8035cc3f9add6a715197f36ed (diff) | |
download | op-kernel-dev-f658d133ba40af54b167a69b149a78bd966fa269.zip op-kernel-dev-f658d133ba40af54b167a69b149a78bd966fa269.tar.gz |
[media] DocBook media: fix xv601/709 formulas
The denominator for the scaling and offsets is 256, not 255. Fix this.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r-- | Documentation/DocBook/media/v4l/pixfmt.xml | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml index 13540fa..f2175f0 100644 --- a/Documentation/DocBook/media/v4l/pixfmt.xml +++ b/Documentation/DocBook/media/v4l/pixfmt.xml @@ -790,9 +790,9 @@ case the BT.601 Y'CbCr encoding is used.</para> is similar to the Rec. 709 encoding, but it allows for R', G' and B' values that are outside the range [0…1]. The resulting Y', Cb and Cr values are scaled and offset:</term> <listitem> - <para>Y' = (219 / 255) * (0.2126R' + 0.7152G' + 0.0722B') + (16 / 255)</para> - <para>Cb = (224 / 255) * (-0.1146R' - 0.3854G' + 0.5B')</para> - <para>Cr = (224 / 255) * (0.5R' - 0.4542G' - 0.0458B')</para> + <para>Y' = (219 / 256) * (0.2126R' + 0.7152G' + 0.0722B') + (16 / 256)</para> + <para>Cb = (224 / 256) * (-0.1146R' - 0.3854G' + 0.5B')</para> + <para>Cr = (224 / 256) * (0.5R' - 0.4542G' - 0.0458B')</para> </listitem> </varlistentry> </variablelist> @@ -802,9 +802,9 @@ is similar to the Rec. 709 encoding, but it allows for R', G' and B' values that to the BT.601 encoding, but it allows for R', G' and B' values that are outside the range [0…1]. The resulting Y', Cb and Cr values are scaled and offset:</term> <listitem> - <para>Y' = (219 / 255) * (0.299R' + 0.587G' + 0.114B') + (16 / 255)</para> - <para>Cb = (224 / 255) * (-0.169R' - 0.331G' + 0.5B')</para> - <para>Cr = (224 / 255) * (0.5R' - 0.419G' - 0.081B')</para> + <para>Y' = (219 / 256) * (0.299R' + 0.587G' + 0.114B') + (16 / 256)</para> + <para>Cb = (224 / 256) * (-0.169R' - 0.331G' + 0.5B')</para> + <para>Cr = (224 / 256) * (0.5R' - 0.419G' - 0.081B')</para> </listitem> </varlistentry> </variablelist> |