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Problem with cex=0.1 when making jpegs

Looking at ?points I see information that appears directed at this  
question:

Value pch="." (equivalently pch = 46) is handled specially. It is a  
rectangle of side 0.01 inch (scaled by cex). In addition, if cex = 1  
(the default), each side is at least one pixel (1/72 inch on the pdf,  
postscript and xfig devices).

The points appear with plot(1:10, pch = ".", cex=1)

I can still see the points in a pdf output when pch="." and cex=0.5,  
but when directed to a jpg file, the points are no longer visible on  
my Mac 10.5.6 running R 2.8.1 Patched (2009-01-07 r47515)