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00005fff
2004 Oct 07
3
How to use alpha transparency channel for colors?
...provides the ability to return the alpha component of
colours (as well as the red, green, and blue components).
I'm using R 2.0.0 on Windows 2000 and wanted to try this feature. The
following simple test works fine:
pdf("c:/alpha.pdf")
plot(rnorm(1:100),rnorm(1:100),col="#000055ff",pch=16)
dev.off()
But as soon as I change alpha value from "ff" to "fe", the points are no
longer visible for me. I've tried viewing the pdf with Acrobat Reader
5.1.0 and gsview4.5.
Do I need a more recent pdf viewer? Is this feature not working on
Windows? Am I d...