[R] Should gv be able to read bitmap(... type= "pdfwrite") ?

[Prof Brian D Ripley]

On 11 Jul 2001, Michael A. Miller wrote:

> >>>>> "John" == John Williams <jwilliams at business.otago.ac.nz> writes:
>
>     > Hi there folks I have R 1.3.0 running on Red Hat Linux 7.1
>     > with GhostView 3.5.8.  When I produce a file like:
>
>     >> bitmap("foo.pdf", type="pdfwrite")
>     >> plot(foo)
>     >> dev.off()
>
>     > and then try to read it with gv, I get an unrecoverable
>     > error and nothing displayed.
>
> That works for me (R 1.3.0-1, Debian testing, gs 5.10-10.1, gv
> 3.5.8).
>
> On a related note, when using type="pdfwrite", bitmap doesn't
> actually produce bit mapped graphics.  For vector graphics I
> normally use the postscript device, and more recently, the pdf
> device, as in
>
>     > postscript("foo.ps"); plot(foo); dev.off()
>
> and
>
>     > pdf("foo2.pdf"); plot(foo); dev.off()
>
> I have noticed that bitmap("foo.pdf", type="pdfwrite") produces
> different results than pdf("foo2.pdf") does: bitmap(...) uses
> ghostscript and makes version 1.2 pdf which pdf(...) doesn't use
> ghostscript and makes version 1.1 pdf.  The practical consequence
> of this seems to be that the v1.2 pdf file is smaller and that

(It uses flate compression: pdf uses none.  There is a good reason for
that: all including applications can compress the final file, and
compressing the intermediates is only a minor space saving.)

> the v1.2 pdf file has text labels that are more similar to what I
> see on my screen (but still somewhat larger than on screen, the
> v1.1 text is much larger).  The postscript device produces files
> that have text that looks very close to what I see on screen.

(That's related to the defaults for width, height and pointsize.  You
can alter any of them to get what you want ....)

> Mike
>
> --
> Michael A. Miller                      mmiller3 at iupui.edu
>   Krannert Institute of Cardiology, IU School of Medicine
>   Indiana Center for Vascular Biology and Medicine
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-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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