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Re: Colour blindness and accessibility - thanks for reponses

From: Lois Wakeman <lois@lois.co.uk>
Date: Thu, 1 May 2003 10:27:56 +0100
Message-ID: <006b01c30ff1$2ad89d80$9601030a@bowser.hhb.com>
To: <w3c-wai-ig@w3.org>
Cc: <immelie@hotmail.com>

Many thanks for everyone who has taken the trouble to post some interesting
responses to my enquirer's questions. To sum up in a sentence, we have two
checkers (I only knew of the first before), and particular practical
problems seem to be colour codes for electrical wiring and components, and
use of red/green or red/black to distinguish items on screen and in the
physical world.

To these, I can add my own example from the olden days when editors used a
red and black biro taped together to correct galley proofs. My friend Gordon
is colour blind, and cannot tell the difference between red and black, as
has already been mentioned by others. So, he used a green and black biro
pair, to the confusion of the printers, who expect markup to be in red.

> http://www.vischeck.com/vischeck/
> http://colorfilter.wickline.org/

Of course, following WAI guidelines, we never use colour only to distinguish
things, do we? <G>

Anyone wanting more technical info on the physical basis and effects of the
condition might find this link useful:


Lois Wakeman

Received on Thursday, 1 May 2003 10:51:19 UTC

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