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From David Crossley <>
Subject Re: Clutch color coding
Date Thu, 04 Dec 2008 09:09:59 GMT
David Crossley wrote:
> Tim Williams wrote:
> > 
> > Hi David,
> Nice to hear from you Tim.
> > I suppose you can't please everyone, but the red/green colors in this
> > version are difficult to distinguish - colorblind.  It would help to
> > find a shade of green with lighter/darker tone (e.g. 33cc66)?  Anyway,
> > my nit-picky 2cents.
> That is a very important point.
> I will refine the colours today. Thanks for your help.

Hey wow, i think we can please everyone.

My searches led to the "Color Universal Design (CUD)
Colorblind barrier-free color Pallette"
by Masataka Okabe and Kei Ito. [1]
They have developed a set of colours that are

See my test page at

The top section shows results for simulation for
the new CUD scheme. The important parts of the table
are emphasised for everybody.

The bottom section shows shows results for simulation
for the red-orange-green scheme. The results are very poor
for the two main colour vision deficiencies.

I would to acknowledge the assistance of some great public
on-line tools which enabled me to do this work:

Color Universal Design (CUD) - How to make figures and
presentations that are friendly to Colorblind people

Colour Blindness Simulator - Etre. 

Colorblind Web Page Filter. 

Accessibility Color Wheel.


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