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Re: [TECH] Colour Difference Algorithm

From: Joe Clark <joeclark@joeclark.org>
Date: Thu, 4 Sep 2003 16:52:14 -0400 (EDT)
To: WAI-GL <w3c-wai-gl@w3.org>
Message-ID: <Pine.BSO.4.53.0309041200420.7788@mail.veldt.ca>

> > Don't set green on red or red on green.
>
> A good start. But what are the RGB values, or range of RGB values, for these
> colors?

It's a question of wavelengths, to which the cones of the retina are
sensitive, not RGB values, to which they are not.

One could quite possibly read up on that.

> They might not appeal to your artistic sensibility but are they an
> accessibility problem?

WAI doesn't *have* an artistic sensibility.

To colourblind people (protans, deutans, and those with protanomalous and
deuteranomalous conditions), yes. Tritans, probably not.


> ----- Original Message -----

Yeah, Chris, we saw that.

> > At 03:55 PM 8/28/2003, you wrote:

Yeah, Wendy, we saw that.

--

  Joe Clark  |  joeclark@joeclark.org
  Author, _Building Accessible Websites_
  <http://joeclark.org/access/> | <http://joeclark.org/book/>
Received on Thursday, 4 September 2003 16:55:46 GMT

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