Try changing the color to "grey".
Despite the help pages saying this:
colormodel
a character string describing the color model: currently allowed
values are "rgb", "gray" and "cmyk". Defaults to "rgb".
I got the expected behavior by making the "gray" -> "grey" change on
my Mac OS 10.5.6/R2.8.1 system.
--
David Winsemius
On Jan 23, 2009, at 7:21 PM, Luis Torgo wrote:
I'm trying to create figures in PDF that use the 'gray' colormodel
instead of the default 'RGB' model, by requirements of a publisher.
My problem has to do with the fact that I'm not being able to get
gray colors with this option on the pdf() driver. Here is a small
example for problem replication:
> R.version
_ platform i486-pc-linux-
gnu arch i486
os linux-gnu system i486, linux-
gnu status
major 2 minor
8.1 year 2008
month 12 day
22 svn rev 47281
language R version.string R version
2.8.1 (2008-12-22)
> pdf('exp.pdf',colormodel='gray')
> barplot(table(subset(iris,Petal.Width>1)$Species))
> dev.off()
Contrary to what I was expecting the bars appear in black and not
gray as they are supposed to. This is not particularly serious for
this toy graph but for others it creates more problems.
Interesting enough this problem does not occur with the same option
on the postscript() driver as it can be observed by running:
> postscript('exp.eps',colormodel='gray')
> barplot(table(subset(iris,Petal.Width>1)$Species))
> dev.off()
Any help is most appreciated.
Luis Torgo
--
Luis Torgo
FEP/LIAAD - INESC Porto, LA Phone : (+351) 22 339 20 93
University of Porto Fax : (+351) 22 339 20 99
R. de Ceuta, 118, 6o email : lto...@liaad.up.pt
4050-190 PORTO - PORTUGAL WWW : http://www.liaad.up.pt/~ltorgo
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