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[imsc] Need to tie image size to the relevant presented region not just any presented region.

From: nigelmegitt via GitHub <sysbot+gh@w3.org>
Date: Tue, 24 Nov 2015 12:30:27 +0000
To: public-tt@w3.org
Message-ID: <issues.opened-118599079-1448368226-sysbot+gh@w3.org>
nigelmegitt has just created a new issue for 
https://github.com/w3c/imsc:

== Need to tie image size to the relevant presented region not just 
any presented region. ==
§8.2.1 defines a presented image:

> A presented image is a `div` element with a `smpte:backgroundImage` 
attribute that does not extend beyond a presented region.

where _presented region_ is defined in §6.8.1.

There are at least two issues with the sentence in §8.2.1, that means 
it does not match the correct text in §8.3:
1. it is not clear that the size of the image is constrained by the 
specific region in which the div is flowed; rather it can be any 
presented region - and up to 4 can be simultaneously visible, each 
having a different size.
2. the _attribute_ does not have a size in any meaningful way; rather 
the referenced image has a size.

Suggested fix:

> A presented image is a `div` element with a `smpte:backgroundImage` 
attribute that references an image whose extent is no larger than the 
extent of the presented region into which the `div` is flowed.


Please view or discuss this issue at 
https://github.com/w3c/imsc/issues/96 using your GitHub account
Received on Tuesday, 24 November 2015 12:30:29 UTC

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