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Re: Colours and Colour Blindness

From: Patrick H. Lauke <redux@splintered.co.uk>
Date: Thu, 17 Feb 2005 23:54:03 +0000
Message-ID: <42152E9B.2050505@splintered.co.uk>
To: w3c-wai-ig@w3.org

Mike Brown wrote:
  > http://centricle.com/ref/css/filters/
> I understand that the "Y" is green and the "N" red, and that the 
> difference is quite clear to most people. I'm red/green colour-blind and 
> find it almost impossilbe to tell a difference - with a good 19" monitor 
> in good light.
> This is the best example I've come across of a "genuine", as opposed to 
> "test-case", page where the use of colour makes a huge difference to the 
> usability of the page for me.

Maybe I'm going to split hairs here, but: yes, it makes a huge 
difference in terms of usability, but no in terms of accessibility. The 
information *is* provided in a format that you can use and understand 
even if colours are completely disabled or the difference between them 
is inperceptible. It does draw on a classic green=go, red=stop metaphor. 
Now, if that table relied solely on colour, it would obviously be 
another matter.

Patrick H. Lauke
re·dux (adj.): brought back; returned. used postpositively
[latin : re-, re- + dux, leader; see duke.]
www.splintered.co.uk | www.photographia.co.uk
Received on Thursday, 17 February 2005 23:52:45 UTC

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