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From: "Ben A L Jemmett" <bal.jemmett@ukonline.co.uk>
Subject: Re: Colour DEFICIENCY  was Re: Full color Text Adventures?
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Date: Wed, 20 Feb 2002 14:15:47 GMT
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"David Thornley" <thornley@visi.com> wrote in message
news:CKvc8.42341$Wf1.8211607@ruti.visi.com...
> That's the idea about the color blindness tests, I think.  You get
> a bunch of circles with, say, color differences making a 7.
> Presumably some other difference, perhaps circle size, makes a 3,
> but I never could make that out.

I think they work using some interaction between contrast and colour vision,
so normal colour vision sees one set of coloured dots and deficient vision
sees a different pattern in the contrast.  I see the 'deficient' pattern for
the blue/violet tests and no pattern whatsoever for the red/green ones.

A lot of people get weirded out when they say 'oh, that's a 7' and the next
bloke says 'no, it's a 3' or 'where's a 7?'.  i think it stems from the fact
that our colour vision is something we take for granted; we all sort of know
what the colours look like, but never how someone else is seeing them.

--
Regards,
Ben A L Jemmett.
(http://web.ukonline.co.uk/ben.jemmett/, http://www.deltasoft.com/)



