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Re: Questions about Evaluating Web Sites...

From: Charles McCathieNevile <charles@w3.org>
Date: Fri, 24 May 2002 09:48:37 -0400 (EDT)
To: Chuck Letourneau <cpl@starlingweb.com>
cc: <w3c-wai-eo@w3.org>
Message-ID: <Pine.LNX.4.30.0205240947140.20277-100000@tux.w3.org>
well, people are relying on similar algorithms. This is a bit like asking an
inexperienced user to check with a speech browser - most users take a while
to learn how they work, so most tests only show how a small minority of naive
users will experience something. But I think it remains a useful test..


Charles McCN

On Fri, 24 May 2002, Chuck Letourneau wrote:

  Regarding my question of black-and-white versus gray scale testing for
  contrast problems, Charles wrote:

  >Well, 2 color is about the extreme limit of conditions that people have. On
  >the other hand, there are people who need that kind of setup, so I would
  >think it is a reasonable thing to do.

  I think my concern with two-color viewing or printing is that the algorithm
  that decides whether to replace a color with black or with white may lead
  to unrealistic contrast displays.  It would seem likely that some color
  combinations that would appear very similar in a good gray scale rendering
  (and thus be shown to have too low contrast) could be rendered very clearly
  if black and white were the only choices the system had.

  Maybe this is too unlikely a scenario. Unfortunately, I  don't have an
  example I can point at to support my concern - just a memory of having
  encountered the problem at some time in the past six years.  I don't think
  we need to pursue this further unless the working group has strong feelings
  about changing the point.


Charles McCathieNevile    http://www.w3.org/People/Charles  phone: +61 409 134 136
W3C Web Accessibility Initiative     http://www.w3.org/WAI  fax: +33 4 92 38 78 22
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Received on Friday, 24 May 2002 09:48:45 UTC

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