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> wrote:

> ISSUE-309 (Image profile fails WCAG 1.2): Image profile needs to permit
> text equivalent [TTML IMSC 1.0]
>
> http://www.w3.org/AudioVideo/TT/tracker/issues/309
>
> 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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