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webp-container-spec: Tighten language added by last

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Change-Id: Id7719ba7f1ddfd7b54a1985771b2811318a7c0d7
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Lou Quillio 2013-06-26 17:36:55 +00:00 committed by James Zern
parent a34a502989
commit c606182edd
1 changed files with 8 additions and 9 deletions
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17
doc/webp-container-spec.txt
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@ -382,18 +382,17 @@ animation.
Background Color: 32 bits (_uint32_)
: The default background color of the canvas in \[Blue, Green, Red, Alpha\]
byte order. This color is used to fill the unused space on the canvas around the
frames, as well as the transparent pixels of the first frame. Background color
is also used when disposal method is `1`.
byte order. This color MAY be used to fill the unused space on the canvas around
the frames, as well as the transparent pixels of the first frame. Background
color is also used when disposal method is `1`.
**Notes**:
**Note**:
* Background color may contain non-trivial alpha even though _Alpha_ flag in
[VP8X chunk](#extended_header) is unset.
* Background color MAY contain a transparency value (alpha), even if the
_Alpha_ flag in [VP8X chunk](#extended_header) is unset.
* Viewers that have a preferred background against which to present the
images (web browsers, for example) should ignore this value and use their
preferred background color instead.
* Viewer applications SHOULD treat the background color value as a hint, and
are not required to use it.
Loop Count: 16 bits (_uint16_)