[R] Problem with colormodel in pdf driver

[David Winsemius]

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 : ltorgo at liaad.up.pt
>  4050-190 PORTO - PORTUGAL     WWW   : http://www.liaad.up.pt/~ltorgo
>
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