"transparent" background for PDF

Colleagues

Running R2.2.1 on either a Linux (RedHat 9) or Mac (10.4) platform.

I created a PDF document using pdf("FILENAME.pdf", bg="transparent",
version="1.4").  I then imported the graphic into PowerPoint -
background was set to a non-transparent color.  I was hoping that the
inserted graphic would be transparent - instead, it had a white
background.

According to my experience, this is a "feature" of PowerPoint which 
seems to be incapable to display transparent background in PDF. This 
also concerns transparent background PDF's from other programmes than 
R. This experience is from Linux & Mac (pdf) and PP in Mac (never tried 
that with PowerPoint on Linux...).

cheers, jari oksanen
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Jari Oksanen, Oulu, Finland