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ISSUE-210 (rgba() alpha value space): The values for alpha in rgba() don't correspond to CSS3 Color definitions [TTML 1.0]

From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Wed, 15 May 2013 23:18:24 +0000
Message-Id: <E1Uckxk-0004nQ-4i@crusher.w3.org>
To: public-tt@w3.org
ISSUE-210 (rgba() alpha value space): The values for alpha in rgba() don't correspond to CSS3 Color definitions [TTML 1.0]

http://www.w3.org/AudioVideo/TT/tracker/issues/210

Raised by: Glenn Adams
On product: TTML 1.0

As presently defined, we allow the alpha value in an rgba() tuple to take a value from 0 to 255, rather than 0.0 to 1.0 (or 0% to 100%) as defined in CSS3 Color. On the other hand, we do use the CSS3 Color alpha values of 0.0 to 1.0 for opacity. This creates a bit of an anomaly if we should want to define tts:color in terms of CSS3 Color's definition of 'color'.

I'm presently marking this for TTML1.0, if we want to address in TTML10SE. Otherwise, we should push out to TTML.next.
Received on Wednesday, 15 May 2013 23:18:25 UTC

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