Colour blindness

Pia Waugh greebo at
Tue Jul 8 20:06:43 EDT 2008

Hi Walter,

<quote who="Walter Bender">

> The most typical color-blindless is a red-green confusion. Black-green
> should not be an issue as this is contrast in value, not chroma.
> However, the point is well taken. Some of the on-screen color
> combinations may well be problematic. The general rule of thumb is to
> provide at least two Munsell value steps of contrast to ensure enough
> contrast for legibility. I think we are OK on the keyboard itself in
> that respect.

OK, great. The education specialist said the black on green wasn't a high
enough contrast. I'm happy to follow this up with the local vision and
accessibility authority if that would be useful.

By the way, lovely to meet you :)


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