- From: Chuck Letourneau <cpl@starlingweb.com>
- Date: Fri, 28 Jun 2002 09:47:39 -0400
- To: w3c-wai-eo@w3.org
- Message-Id: <4.3.2.7.2.20020628094636.00af35c0@host.igs.net>
I forgot to copy this reply to Jean-Marie to the EO list. So, here you go... >Date: Mon, 24 Jun 2002 22:40:09 -0400 >To: "Jean-Marie D'Amour" <jmdamour@videotron.ca> >From: Chuck Letourneau <cpl@starlingweb.com> >Subject: Re: Contrast and grayscale > >Jean-Marie, you raise a good point relating to the metrics of usability >and accessibility. Determinations of suitable contrast, minimum usable >size (e.g. of linked images) and clearness and simpleness of text are, for >most evaluators, going to be subjective. Even if some application or tool >can analyze color content and contrast (see Eric Velleman's reply to >Jean-Marie), or active area size, or language complexity, and warn an >evaluator that there is a potential problem, there is no single fix that >will satisfy all people. Because of the wide range of human functional >abilities it is very difficult (perhaps impossible) to specify lower >limits that will satisfy everyone. The subjective techniques we propose >for assessing these things may be the best we can do: in some cases we >hope they will clearly identify potential problems to the evaluators -- in >other cases they may miss the mark entirely. > >I think we must continually remind designers that incremental or relative >improvements do have merit: if you improve contrast, choose better colors, >make text larger, make content clearer, etc. you will include more >people. But in many cases, it may only be end users who can verify if any >design choices we make are sufficient. This is why "User testing of >accessibility" and why having mechanisms for capturing (and procedures for >acting on) user feedback is such an important requirement for Conformance >Evaluation. > >Regards, >Chuck Letourneau > >At 18/06/02 09:00 AM, Jean-Marie D'Amour wrote: > >>Hello, >> >>I have tested our recommandation about evaluating contrasts with >>grayscale in the context of a trainig. >>I'm not satisfied about this because this kink of evaluation is very >>subjective. >>The checkpoint itself is rather subjective. >> >>Thanks >>Jean-Marie
Received on Friday, 28 June 2002 09:48:29 UTC