transparent grays?
Try this: with(trees, symbols(Height, Volume, circles=Girth/24, inches=FALSE, fg = "gray30", bg = sapply(apply(rbind(col2rgb(gray(seq(0,1, l = 10)))/255, alpha = 0.5), 2, as.list), do.call, what = rgb)))
On Thu, Mar 31, 2011 at 2:52 PM, Frostygoat <frostygoat at gmail.com> wrote:
Is there a grayscale equivalent to alpha levels in rgb? Example: ?I have the following to make red transparent circles overlap with previously plotted blue symbols. symbols(x=sites$long,y=sites$lat,circles=log(sites$prop.nem +1),add=T,inches=F,bg=rgb(red=1,green=0,blue=0, alpha=0.5),fg=rgb(red=1,green=0,blue=0, alpha=0.5)) I'm having a hard time coming up with a grayscale equivalent. Thanks!
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