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Maximum discrepancy palette
2 messages · Etienne B. Racine, Michael Sumner
Try the RColorBrewer package, with function ?brewer.pal You probably want a Qualitative palette, the details are in that function's help page. Cheers, Mike.
On Tue, Dec 13, 2011 at 10:14 AM, Etienne B. Racine <etiennebr at gmail.com> wrote:
I'm looking for a palette that would maximize the discrepancy with neighbouring elements. I have a raster image of objects tagged with integers. I'd like to highlight the different objects by using a palette that would maximize this difference with neighbours as close numbers tend to be neighbours. Of, course, I don't expect this to be color-blind safe are even beautiful, but, I'd like to have a good chance of separating neighbours. It looks a bit like : x <- structure(c(1, 1, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 3, 2, 1, 1, 1, NA, NA, 3, 1, 4, 4, 3, 3, 3, 4, 4, 3, 3, 3, 3), .Dim = c(6L, 6L)) image(x) # i've tried things like image(x, col = sample(rainbow(5))) But with number of objects increasing (~80), I tend to have same colours (or very close ones) as neighbours. Does that palette exist ? Thanks, Etienne ? ? ? ?[[alternative HTML version deleted]]
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Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsumner at gmail.com