On Thursday 07 October 2004 10:01, [EMAIL PROTECTED] wrote:
> The release notes for R 2.0.0 states:
>
> It is now possible to specify colours with a full alpha
> transparency channel via the new 'alpha' argument to the
> rgb() and hsv() functions, or as a string of the form "#RRGGBBAA".
>
> NOTE: most devices draw nothing if a colour is not opaque,
> but PDF and Quartz devices will render semitransparent colours.
>
> A new argument 'alpha' to the function col2rgb()
> 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")
You probably just need (see ?pdf)
pdf("c:/alpha.pdf", version = "1.4")
> 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 doing something wrong? Any tips would be appreciated.
>
> Thanks,
>
> Kevin Wright
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