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

From: Sean Hayes <Sean.Hayes@microsoft.com>
Date: Fri, 17 May 2013 19:29:16 +0000
To: Timed Text Working Group <public-tt@w3.org>
Message-ID: <E9A92BD0A4FC934EB7935470A46D15241F651B5A@DB3EX14MBXC325.europe.corp.microsoft.com>
Yes I think the CSS WG did the ol switheroo on us here.  I think this again is a v next issue for CSS compatibility.

-----Original Message-----
From: Timed Text Working Group Issue Tracker [mailto:sysbot+tracker@w3.org] 
Sent: 16 May 2013 00:18
To: public-tt@w3.org
Subject: ISSUE-210 (rgba() alpha value space): The values for alpha in rgba() don't correspond to CSS3 Color definitions [TTML 1.0]

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 Friday, 17 May 2013 19:30:14 UTC

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