At 13:05 20/02/2009, John Fox wrote:
Dear Thomas,
Though far from an expert on the matter, it's my understanding that
red-green confusion is the most common form of colour-blindness. I guess
that the best way to put it is that it would be desirable to choose colours
for the standard palette that minimize the probability of perceptual
problems.
I wonder whether there are two separate issues: what is the best
standard palette and whether mainstream plots should use colour to
carry essential information. For instance there seems little problem
in biplot having red arrows and black points because the colour is redundant.
I am not an expert on colour vision either but there certainly are
people who report difficulty at scientific meetings with interpreting
the slides.
Regards,
John
> -----Original Message-----
> From: Thomas Lumley [mailto:tlum...@u.washington.edu]
> Sent: February-20-09 4:32 AM
> To: John Fox
> Cc: 'John Maindonald'; 'Prof Brian Ripley'; r-devel@r-project.org; 'Martin
> Maechler'
> Subject: Re: [Rd] plot.lm: "Cook's distance" label can overplot point
labels
>
> On Thu, 19 Feb 2009, John Fox wrote:
>
> > Dear John and Brian,
> >
> > My point about colour-blindness was partly tongue-in-cheek, but I think
> that
> > it's a bad choice to have the second and third colours in the default
> > palette as red and green.
> >
>
> Looking at the standard palette with dichromat::dichromat() it seems that
it
> depends on which flavour of red-green anomaly you have. For deuteranopia
the
> red and green are quite close. For protanopia they are pretty distinct and
> the confusion is between colours 3 and 7 (yellow vs green) and between 4
and
> 6 (blue and magenta).
>
> I agree that the standard palette isn't ideal, though.
>
> -thomas
>
> Thomas Lumley Assoc. Professor, Biostatistics
> tlum...@u.washington.edu University of Washington, Seattle
>
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