From 5e9675329c6d409e17f1d3937f144ada12e87c02 Mon Sep 17 00:00:00 2001 From: Urvang Joshi Date: Thu, 20 Jun 2013 17:38:08 -0700 Subject: [PATCH] Container spec: a clarification on background color. Change-Id: Ifeb565bd162abfa03dfcbf8b576657fe83956a6c --- doc/webp-container-spec.txt | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/doc/webp-container-spec.txt b/doc/webp-container-spec.txt index f3d75310..63f7e199 100644 --- a/doc/webp-container-spec.txt +++ b/doc/webp-container-spec.txt @@ -386,9 +386,14 @@ 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`. -**Note**: 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. +**Notes**: + + * Background color may contain non-trivial alpha even though _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. Loop Count: 16 bits (_uint16_)