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Re: /colour/colourblindness.html

From: Wendy A Chisholm <wendy@w3.org>
Date: Tue, 05 Feb 2002 18:32:40 -0500
Message-Id: <>
To: Peter <peter@petermoulding.com> (by way of Wendy A Chisholm <wendy@w3.org>), w3c-wai-gl@w3.org
Vischeck is a tool that can show a web page as seen by 3 different types of color deficiency:


At 09:44 AM 2/5/02, Peter wrote:
>2/5/02 6:26:30 PM, jonathan chetwynd <j.chetwynd@btinternet.com> wrote:
>>I imagine what is needed is a validator, so that users can 'see' what 
>>their page would look like.
>>http://www.peepo.com "enjoy surfing the net"
>Hello Jonathan,
>What I envisage are pages where people with known colour discrimination problems can look at colour samples and 
>report back on the result. They would identify the type of screen they use, crt, lcd, etc, and tick colour pairs that look 
>different but not those that look the same. Each result would add to the information displayed and Web site developers 
>could look to see the contrast required between colours.
>Each sample would display the HTML RGB parameter and any equivalent useful to image editors. People creating 
>HTML could look for colour differences with universal acceptance and those without. If the information is presented as 
>colour differentials, it could lead to a simple page where people type in their preferred colours and get the problem 
>combinations highlighted. If someone wants to then take the calculations from the script and place them in to a validator, 
>I could help.
>People creating images would get the general idea but creating an image validator would be difficult. Way beyond my 
>poor brain. Easier to just have examples of what works and what does not.

wendy a chisholm
world wide web consortium 
web accessibility initiative
seattle, wa usa
Received on Tuesday, 5 February 2002 18:30:13 UTC

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