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Re: Colorblindness references

From: Charles McCathieNevile <charles@w3.org>
Date: Tue, 30 Jan 2001 03:00:04 -0500 (EST)
To: Dick Brown <dickb@microsoft.com>
cc: <w3c-wai-gl@w3.org>
Message-ID: <Pine.LNX.4.30.0101300258330.22623-100000@tux.w3.org>
I agree with Dick that recommending colour schemes in a checkpoint is a bad
idea. But I think it might be helpful if there are techniques that can
provide a few choices of three, four or five different colours that are
generally OK used together, or an algorithm for determining this. (There is
actually a tool out there that will do a colour-blindnes simulation, but that
doesn't help if you are colour-blind).

Charles McCN

On Fri, 26 Jan 2001, Dick Brown wrote:

  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).


Charles McCathieNevile    http://www.w3.org/People/Charles  phone: +61 409 134 136
W3C Web Accessibility Initiative     http://www.w3.org/WAI    fax: +1 617 258 5999
Location: I-cubed, 110 Victoria Street, Carlton VIC 3053, Australia
(or W3C INRIA, Route des Lucioles, BP 93, 06902 Sophia Antipolis Cedex, France)
Received on Tuesday, 30 January 2001 03:00:06 UTC

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