R colors

library(RColorBrewer)
display.brewer.all()
example(RColorBrewer)
n=10
barplot(1:n, col=brewer.pal(n,'GnBu'))

n = 32
library(gplots)
palette(rev(rich.colors(n)))
plot(1:n,pch=16,cex=1:n,col=1:n)

cols = c('chocolate3', 'darkgreen', 'blue4', 'lightsalmon1', 'darkseagreen1', 'steelblue2')

alpha = 0.5
col = rgb(0,1,0,alpha)

n = 20
palette(rainbow(n))
plot(1:n, pch=16, cex=1:n, col=1:n)