Have a look at the Polychrome package by Kevin Coombes and Guy Brock:
https://CRAN.R-project.org/package=Polychrome
This employs the LUV space (with HCL = polar LUV) to get many distinct
distinguishable colors. For a few first steps, see:
https://CRAN.R-project.org/web/packages/Polychrome/vignettes/polychrome.html
On Wed, 12 Sep 2018, Zach Simpson wrote:
Hi Federico
For a possible alternative, the scico package provides a nice
collection of color palettes that are designed to be both color-blind
friendly and differentiable:
https://www.data-imaginist.com/2018/scico-and-the-colour-conundrum/
You could generate a vector of 21 colors (spaced as far apart as
possible on the palette) to pass to your plot arguments with something
like:
library(scico)
scico(21, palette = 'oleron')
Not sure if this works for your case though. But maybe another feature
(shape?) could help differentiate the 21 points.
Hope this helps,
Zach Simpson
Message: 11
Date: Tue, 11 Sep 2018 07:34:51 +0000
From: Federico Calboli <federico.calb...@kuleuven.be>
To: "r-help@r-project.org" <r-help@r-project.org>
Subject: [R] getting 21 very different colours
Message-ID: <08a6397b-4d67-4195-a53a-1fd394f72...@kuleuven.be>
Content-Type: text/plain; charset="utf-8"
Hi All,
I am plotting a scatterplot of 21 populations, and I am using
rainbow(21)[pops.col] to generate 21 colours for the plot (which works). Maybe
it is because I can really process few colours at a time, but the differences
between the colours are not as strong as I’d like. I can specify start and end
for rainbow(), but if anything that looks worse if I do not just stick to 0 and
1.
Is there a way of getting a set of 21 colours that maximises the differences
between them?
I could pick them by hand, but that is about 15 colours more than I know (I
have a detailed colourchart, but the visual differences between ’skyblue’ and
’slategrey’ elude me when plotted as dots on a plot).
Cheers
F
--
Federico Calboli
LBEG - Laboratory of Biodiversity and Evolutionary Genomics
Charles Deberiotstraat 32 box 2439
3000 Leuven
+32 16 32 87 67
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