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Re: dynamic images

From: Wendy A Chisholm <wendy@w3.org>
Date: Tue, 29 May 2001 16:19:24 -0400
Message-Id: <>
To: "Steven McCaffrey" <SMCCAFFR@MAIL.NYSED.GOV>, <anthony@frontend.ie>, <w3c-wai-ig@w3.org>

It seems to me if the data is there to generate an image, then it could be 
used to generate a variety of presentations, couldn't it?

Perhaps as a data table (with good markup) or linearized text in some way?

So, basically what Steven asked.

At 09:13 AM 5/29/01 , Steven McCaffrey wrote:
>Hello Anthony:
>     Wow, dynamically varying charts.
>You mentioned a text feed.  Does this change dynamically too?  I would 
>assume so.  I think this could be handled if say a single value was 
>varying like a price of a single stock chart and the price was in ASCII 
>text on the screen.  Some (most?) screen readers have advanced features 
>all loosely called monitors or, confusingly frames, that can "monitor" a 
>user defined area of the screen.  Advanced users can use the screen 
>reader's scripting language to write sophisticated programs to do 
>something if this user defined area changes.  The minimnum is to read the 
>area itself but you could tell it to read any other portion of the screen 
>as well.  This, as I said, is for the rather advanced screen reader 
>user.  The latest version of JFW's Frame Manager makes defining such areas 
>and taking various actions much easier than previously but I don't know 
>about other screen readers.  The area itself must be well defined so you 
>can specify a rectangle around it.  If the area were to move, thi!
>s would make it very difficult if not impossible.  I would not want to see 
>site designers depend on the user being able to do this - at least not yet.
>Information Technology Services
> >>> "Anthony Quinn" <anthony@frontend.ie> 05/29/01 08:49AM >>>
>Hi All,
>Are there accessibility issues surrounding dynamically generated images,
>such as stock charts etc, which are different to static images? It strikes
>me that it would be difficult to generate meaningful alt text for a dynamic
>image, as the content of the image is always changing. I imagine the issue
>is particularly difficult in the case of a dynamic graph, although I suppose
>you could have an alternate text feed - does this sound like a sensible
>Just curious,
>Anthony Quinn - Head of Interaction Design
>Frontend - Usability Engineering & Interface Design
>40 Westland Row, Dublin 2, Ireland
>email anthony.quinn@frontend.com
>web http://www.frontend.com
>tel  +353 1 24 11 600
>fax +353 1 24 11 601
>Visit our Usability InfoCentre at:

wendy a chisholm
world wide web consortium
web accessibility initiative
seattle, wa usa
tel: +1 206.706.5263
Received on Tuesday, 29 May 2001 16:14:16 UTC

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