Thread Subject: Re: Allen's proposal for a newsection oncontent

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From: David Poehlman
Date: Tue, Apr 03 2007 9:00 AM

One danger in this I see. If we allow direct draw, we run the risk of
not being able to take advantage of future possibilities. Also, don't
you know? Braille comes in colors.



On Apr 3, 2007, at 10:53 AM, Gregg Vanderheiden wrote:

Following up for clarification:


Peter Korn Wrote:
Gregg Vanderheiden writes:

> On the first point, (i.e. color values of the forground text and
> background) I still am not sure I understand the benefit. If the
> content is rendered to the screen the AT can always get the color
> values. But from discussions in our other group it was my
> understanding that there are no AT that can deal with presenting the
> millions of colors to people in a way that they can understand.

This is a bad assumption. Content rendered via DirectDraw or some other
mechanism allowing applications to communicate directly to video memory
frame buffers may not such that "AT can always get the color values".
Nor in a requirement about content should we assume a content render is
involved. If I am converting this document to Braille or DAISY or some
other format, all I have to go on is the format. If the information I
need for accessibility isn't clearly present in the format, I won't be
able (and shouldn't be required) to run a particular content rendering
application and observe what it does in order to figure out what is
going on.

<end of Peter Korn Clip>


1) even if DirectDraw is used, can't the AT sample the screen at the
point
the letter is drawn and determine the color?

2) if converting the document to braille, then wouldn't the other
provision
which states that 'all information presented in color is also
presented in
another way' meet your needs?


I am just trying to avoid
a) requiring information that AT won't use or the user can't use if
presented to them (like one of 4 million color codes).
b) having two clauses that solve the same problem.


Thanks.






Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.

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