Hi,

 is there an easier way to get a semi-transparent grey-palette?

 plot(1:90, 1:90, pch=16, cex=2, col="red")
 points(1:90, 1:90, pch=16, cex=2, col=rgb(t(col2rgb(grey(90:1/90))), 
alpha=100, maxColorValue=255))

 windows() does support semi-transparent colours

Thanks,
Ingo

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