R help - May 2002 - Lattice background color answer

It turns out that there is a color named "transparent" that does the
trick
with the trellis device.  Thanks to Brian Ripley for pointing it out.

trellis.device(bg="transparent") 

My original post is below, but it boils down to "how can I make a trellis
graph that doesn't contain any background color?" This can be useful
when
you paste graphics into documents that have non-white backgrounds. 

Paranthetically, I note that his response to my question (5/27/02 4:43
PM)actually made it to my mailbox before my actual question did (5/27/02
4:48 PM)...one doesn't get much quicker advice than that. 

PB
-----Original Message----- 
From: Bliese, Paul D MAJ WRAIR-Wash DC 
To: 'r-help at stat.math.ethz.ch' 
Sent: 5/27/02 3:51 PM 
Subject: [R] lattice background color 

I'm sure there is a simple answer to this question, but it stumps me so 
far. 

I've been using R to create graphic images and paste them into other 
programs (Word, PowerPoint). 

Recently, I've been using lattice (wonderful package), but I can't 
figure 
out how to create graphs in lattice that don't have a background color 
-- 
that is, my graphs carry over the grey background if I use the default. 
I 
can change the background color to white, and as long as I paste the 
picture 
into a white document everything is fine, but that only works for white 
documents. 

Any ideas on how to get a NULL background color.  Note that the 
non-lattice 
graphics do not carry over the background color.  The following simple 
solution does NOT work: 
> trellis.device(bg=NULL) 
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