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.
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 > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel