[R] Problem with colormodel in pdf driver

[Prof Brian Ripley]

'gray' is what is in the code: 'grey' uses rgb -- just look at the pdf 
produced.

The issue is that the wrong ('stroke' not 'fill') colour is set in ht 
'gray' colormodel.

On Fri, 23 Jan 2009, David Winsemius wrote:

> 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
>> 
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide 
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595