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Maged NK Boulos* and Guy P Phillipps
Corresponding author: Maged NK Boulos M.N.K.Boulos@bath.ac.uk
International Journal of Health Geographics 2004, 3:10 doi:10.1186/1476-072X-3-10
(2004-05-24 21:04) NYS Department of Health
In addition to red and green, there are a variety of color pairs that tend to be difficult
to distinguish by those with so-called 'red-green color blindness', such as orange
and yellow. Fortunately, cartographers have thoroughly researched this problem and
have designed a variety of color schemes that are discernable by nearly all with color-vision
impairments (1). Examples of these color schemes are freely available at www.colorbrewer.org
(2). The 'traffic-light' color scheme is fine so long as bluish-green is used in place
(1) Olson JM, Brewer CA. An evaluation of color selections to accommodate map users
with color-vision impairments. Annals of the Association of American Geographers 1997;
(2) Harrower M, Brewer CA. Colorbrewer.org: an online tool for selecting colour schemes
for maps. Cartographic Journal 2003; 40: 27-37.
(2004-05-10 15:29) University of Manchester
I followed with interest the BBC web news about your paper and the distribution of
dentists in the UK. I was disappointed on following the link to your 'traffic light'
map that this uses a red-green extreme colour key. Like me, a significant % of your
audience will be red-green colour blind. The use of the 'traffic light' analogy for
a simple public message is great, but there are many other colour schemes that will
not result in 10% of them seeing red (or is it green?)!
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