[R] Colormap that look good in gray scale

[Achim Zeileis]

On Wed, 4 Mar 2009, thibert wrote:

>
> Hi,
>   I am looking for a colormap (in color) that look like a gradient in gray
> scale. It is to allow people without color printer to print the color graph
> and have something meaningful in gray scale.
>
> It can be something like this
> plot(1:6,col=c(1,7,5,3,2,4),pch=c(1,20,20,20,20,20))
> but with an arbitrary number of different colors, not just six.

There is some discussion of this in our manuscript
   Achim Zeileis, Kurt Hornik, and Paul Murrell
   Escaping RGBland: Selecting colors for statistical graphics
which is forthcoming in CSDA (Computational Statistics & Data Analysis), 
for a preprint see
   http://statmath.wu-wien.ac.at/~zeileis/papers/Zeileis+Hornik+Murrell-2008.pdf

This discusses choice of the color, especially for shading areas. If you 
want to use this for shading points or lines, I would recommend to use 
relatively dark and colorful colors and different plotting characters.

R packages that provide useful tools for coloring graphics include 
colorspace, RColorBrewer, ggplot2, and plotrix.

hth,
Z

> Thanks
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