-roger
[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") 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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