Thanks,
Here is my partial solution, from what you suggested me:
library(TeachingDemos)
z<-colors()
zz<-col2grey(z)
#index sorted
zzz<-sort(zz,index.return = TRUE)$ix
x<-z # colors in order or their greyscale
y<-z # greyscale sorted in gradient
for (i in 1:length(z)){
x[i]<-z[zzz[i]]
y[i]<-zz[zzz[i]]
}
myCol<-round(seq(from=1,to=length(x),length.out=10))
myCol<-x[myCol]
I then look at it and change to colors that are too similar for another
value close in geyscale.
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