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RE: ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit text equivalent [TTML IMSC 1.0]

From: John Birch <John.Birch@screensystems.tv>
Date: Wed, 21 May 2014 09:01:33 +0000
To: Timed Text Working Group <public-tt@w3.org>
CC: Glenn Adams <glenn@skynav.com>
Message-ID: <0981DC6F684DE44FBE8E2602C456E8AB014F72D8F4@SS-IP-EXMB-01.screensystems.tv>
This is actually a very old ‘requirement’… (it’s a great pity it is consistently over-looked ☹

http://www.w3.org/2005/03/21/DFXPLastCallResponses.html - specifically Al Gilman’s comments


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From: Glenn Adams [mailto:glenn@skynav.com]
Sent: 21 May 2014 09:41
To: Timed Text Working Group
Subject: Re: ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit text equivalent [TTML IMSC 1.0]

I had previously reported this same comment on the CFF-TT image profile.

On Wed, May 21, 2014 at 5:32 PM, Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org<mailto:sysbot+tracker@w3.org>> wrote:
ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit text equivalent [TTML IMSC 1.0]


Raised by: Nigel Megitt
On product: TTML IMSC 1.0

IMSC1 Image profile [1] defined in §6 does not permit a text equivalent. If this profile is used to provide captions as an alternative to audio then it will fail the WCAG2 guideline 1.2 [2]. From a practical perspective this would mean that users who can neither see nor hear well can not use tools to translate the content into e.g. Braille.

[1] http://www.w3.org/TR/ttml-imsc1/#image-profile-constraints

[2] http://www.w3.org/TR/2008/REC-WCAG20-20081211/#media-equiv

Some potential ways to solve this:
1. Permit text to be included within the image profile that describes the images.
2. Require or recommend that when image profile captions are provided there should be a text profile caption track available simultaneously.

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Received on Wednesday, 21 May 2014 09:02:03 UTC

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