Re: ATSC Liaison to W3C

The sRGB primaries are different to the BT-2020 primaries. They're still essentially red, green and blue though.

Also problematically, it's common to use 10 or 12 bits per channel, which wouldn't work at all well with a #12345678 hex RGBA expression.


From: Michael Dolan <mdolan@newtbt.com<mailto:mdolan@newtbt.com>>
Date: Wednesday, 26 August 2015 15:43
To: 'Timed Text Working Group' <public-tt@w3.org<mailto:public-tt@w3.org>>
Subject: RE: FW: ATSC Liaison to W3C
Resent-From: <public-tt@w3.org<mailto:public-tt@w3.org>>
Resent-Date: Wednesday, 26 August 2015 15:43

Right. I believe the proposal was to leave the primaries alone.  I’m not sure how well that would map to BT-2020 primaries though...

In any event, I think the right answer is to ask for more information.

Regards,
                Mike

From: Glenn Adams [mailto:glenn@skynav.com]
Sent: Wednesday, August 26, 2015 7:18 AM
To: Nigel Megitt <nigel.megitt@bbc.co.uk<mailto:nigel.megitt@bbc.co.uk>>
Cc: Timed Text Working Group <public-tt@w3.org<mailto:public-tt@w3.org>>
Subject: Re: FW: ATSC Liaison to W3C

btw, I think the suggestion that the syntax/value space of tts:color would not change to accommodate this will not work; we can't have #RRGGBB mean something that is not RGB, we can't have rgb() and rgba() mean something that is not RGB; at least we can't do so without completely disregarding history and name to meaning correspondence;

we would need to introduce a new generic color function, e.g., color() to introduce generic color spaces; it would also be better for compatibility purposes as it would signal use of another space;

On Wed, Aug 26, 2015 at 2:42 AM, Nigel Megitt <nigel.megitt@bbc.co.uk<mailto:nigel.megitt@bbc.co.uk>> wrote:
With permission from Mark Richer, making this available on public-tt.

Nigel


From: Mark Richer <mricher@atsc.org<mailto:mricher@atsc.org>>
Date: Thursday, 13 August 2015 21:36
To: Nigel Megitt <nigel.megitt@bbc.co.uk<mailto:nigel.megitt@bbc.co.uk>>, "tmichel@w3.org<mailto:tmichel@w3.org>" <tmichel@w3.org<mailto:tmichel@w3.org>>
Cc: 'Rich Chernock' <rchernock@trivenidigital.com<mailto:rchernock@trivenidigital.com>>, 'Madeleine Noland' <mnoland@noland-consulting.com<mailto:mnoland@noland-consulting.com>>, "chomer@pbs.org<mailto:chomer@pbs.org>" <chomer@pbs.org<mailto:chomer@pbs.org>>
Subject: ATSC Liaison to W3C

Dear Nigel,

Attached you will find a liaison from ATSC to W3C regarding closed captions and subtitles.

Best regards,
Mark

Mark Richer
President
Advanced Television Systems Committee, Inc.
(202) 459-6690<tel:%28202%29%20459-6690>






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