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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_) Background Color: 32 bits (_uint32_)
: The default background color of the canvas in \[Blue, Green, Red, Alpha\] : 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 byte order. This color MAY be used to fill the unused space on the canvas around
frames, as well as the transparent pixels of the first frame. Background color the frames, as well as the transparent pixels of the first frame. Background
is also used when disposal method is `1`. color is also used when disposal method is `1`.
**Notes**: **Note**:
* Background color may contain non-trivial alpha even though _Alpha_ flag in * Background color MAY contain a transparency value (alpha), even if the
[VP8X chunk](#extended_header) is unset. _Alpha_ flag in [VP8X chunk](#extended_header) is unset.
* Viewers that have a preferred background against which to present the * Viewer applications SHOULD treat the background color value as a hint, and
images (web browsers, for example) should ignore this value and use their are not required to use it.
preferred background color instead.
Loop Count: 16 bits (_uint16_) Loop Count: 16 bits (_uint16_)