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Colorblindness references

From: Dick Brown <dickb@microsoft.com>
Date: Fri, 26 Jan 2001 08:49:05 -0800
Message-ID: <7D6F5C23B8944046BC8D1DDED0ED15E002371222@red-pt-02.redmond.corp.microsoft.com>
To: w3c-wai-gl@w3.org
Resending, as it doesn't appear this went through Thursday.
Dick Brown

-----Original Message----- 
From: Dick Brown 
Sent: Thu 1/25/2001 2:49 PM 
To: 'w3c-wai-gl@w3.org' 
Subject: Colorblindness references

I took an action item to send some pointers to resources on colorblindness.

Some of the resources below do in fact indicate what kind of combinations
can often cause problems, and I think it would be appropriate for us to
include those in techniques. I do not think we should *recommend* color
schemes, especially in a checkpoint.

Dick Brown, Microsoft

 <http://msdn.microsoft.com/voices/hess10092000.asp> Can Color-Blind Users
See Your Site?   <http://msdn.microsoft.com/voices/hess10092000.asp>
Columnist Robert Hess continues his series on color use. This time, he
examines how color choices can affect site accessibility. (October 9, 2000)

A site to simulate rendering for people with color vision problems:



From the Microsoft Windows Guidelines for Accessible Software Design at


Avoid Problematic Color Combinations 

Summary: Avoid using colors that commonly cause problems for people with
color vision anomalies.        

There are a number of things that can be done to allow even individuals with
color vision anomalies to be able to take advantage of the color-coded

-- Avoid using common pairs of colors that are indistinguishable by people
with color perception anomalies. For example, avoid mixing green and blue,
or red and green, red and brown, or white and light green.

-- Use colors that differ significantly in hues and intensity

-- Avoid muted colors with low luminance values (intensity).

Received on Sunday, 28 January 2001 08:30:45 UTC

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