Forwarded Message:
> To: Joel West <MacStats at mac.com>
> From: Prof Brian D Ripley <ripley at stats.ox.ac.uk>
> Subject: Re: [R] Exporting graphics to PS or EPS
> Date: Sun, 20 Aug 2000 08:03:26 +0100 (BST)
> -----
> On Sat, 19 Aug 2000, Joel West wrote:
>
> > On Fri, 18 Aug 2000 07:49:44 +0100, Brian D Ripley <ripley at
stats.ox.ac.uk>
wrote:> > >On Thu, 17 Aug 2000, Paul E Johnson wrote:
> > >> My experience is that, if I output a gif that does not
> > >> fit on the page, then I've shot myself in the foot
because resizing the
> > >> graph makes all the text in it too small. I don't think
postscript is
> > >> immune to this problem, but you can for sure convince me
I'm wrong. I
> >
> > >It is. After all, my books on S are done that way, as is much
professional
> > >publishing. If you want to incorporate graphs into other
documents (not,
> > >say, a Web site) use a re-scalable vector format, namely
postscript, PDF or
> > > (on Windows) W/EMF.
> >
> > To second Prof. Ripley, the point of PostScript is that is a device-
independent, resolution-independent page description
language.> >
> > On Fri, 18 Aug 2000 10:36:53 -0400, Griffith Feeney <gfeeney at
hawaii.edu>
wrote:> > >I don't have much experience with this, but I think you may
want eps for
> > >use in TeX documents. You might want to have a look at
> >
> > You absolutely want to use EPSF or instead of PS for any graphic that
> you are going to paste into another document. That's the whole point.
> Raw PostScript is write-only and really only usable for immediate
> downloading to a printer or RIP.
>
> (Not if it is DSC-conformant: see below. Then it is designed to be sent to
> a document manager for page-by-page manipulation.)
>
> > EPSF provides additional context around the PostScript job so that it
> can be placed, and resized by programs that do not include a
> PostScript interpreter. It also includes a low-res bit image so that
> you can view the image on screen during editing. For a description of
> EPSF and various other vector and bitmap formats, see the
> Encyclopedia of Graphics File Formats from O'Reilly at
> > <a
href="http://www.oreilly.com/catalog/gffcd/">http://www.oreilly.com/catalog/gffc
d/</a>>
> The preview image is only required in EPSI (I for Interchange) files. See
> the definitive source, the PostScript Language Reference Manual from Adobe.
> The critical point about EPSF is that it bans some of the PS operators, and
> unfortunately R (up to and including 1.1.1) got that slightly wrong. What
> you are describing is DSC-conformance, and R does manage that.
>
> > PDF was developed in the mid-90s as an editable prepress exchange
> version of PostScript. (That's why it's going to be the native
> graphics format for Mac OS X). A pretty good discussion of how it
> works can be found online at
> > <a
href="http://www.seyboldseminars.com/News/Front/PDFday.html">http://www.seybolds
eminars.com/News/Front/PDFday.html</a>> > An added benefit of PDF over EPSF is that there is a free viewer
> program from Adobe for Windows, Mac, and some of the major flavors of Unix.
>
> ghostscript/ghostview/gv/GSView are more widely available, and
"free" in
> the R sense (Open Source) not just `no cost'. The only `some of the
major
> flavors of Unix' is a big drawback for Acrobat Reader, as is its
bugginess,
> especially on Linux (and as frequently reported on the pdftex list) the
> Mac. These days ghostscript does a pretty good job with PDF.
>
> > Generating PDF is harder than EPSF, but it would be a nice
> extension to R someday.
>
> Take a look at help(bitmap): it is already there. One day we will write a
> direct PDF graphics device, but having an indirect one has lowered its
> priority. (Notice I did mention PDF as an alternative.)
>
> --
> Brian D. Ripley, ripley at stats.ox.ac.uk
> Professor of Applied Statistics, <a
href="http://www.stats.ox.ac.uk/~ripley/">http://www.stats.ox.ac.uk/~ripley/</a>> University of Oxford, Tel: +44 1865 272861 (self)
> 1 South Parks Road, +44 1865 272860 (secr)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
>
>
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