[R] postscript()-resolution

Eik Vettorazzi E.Vettorazzi at uke.uni-hamburg.de
Fri May 8 16:35:40 CEST 2009

Hi Henning,
maybe you just lost the extension (.eps) of the file  when "converting" 
it with ghostview. But R postscript(..,onefile=FALSE) produces actually 
an eps compatible file.
An (encapsulated) postscript file is a vector based file format, so 
there isn't such a thing as a "resulution", since it can be arbitrarily 
rescaled (and a printed version depends on the possible ps-printer dpi.)
When converting it (eg with ghostscript) to a bitmap based filetype, 
such as tiff, you can specify a resulution.


Henning Wildhagen schrieb:
> Dear users,
> another question concerning graphics for publications. My favourite journal 
> wants .eps-graphics,
> and from older postings i adapted the following code:
> postscript(file="Figure1.eps", title="Figure 1", width=11.5, height=8, 
> paper="a4",onefile=FALSE)
> However,  when checking the properties of this file, it is a .ps and not a 
> .eps file. So, i konverted to .eps with ghostview. Then, for windows it is 
> no longer a file of type "postscript", but just a file of type "file", what 
> makes me nervous. Any clue how to produce .eps-files in a more convenient 
> way?
> In addition, the journal says that the files should be at 600 dpi 
> resolution. Since there is no resolution-argument to postscript(), how 
> can  i check/ensure, that the resolution i high enough?
> Thanks for your help,
> Henning
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