[R] PICT output?

M. Edward Borasky znmeb at aracnet.com
Mon Apr 2 01:49:22 CEST 2001

> -----Original Message-----
> From: Patrick Connolly [mailto:P.Connolly at hortresearch.co.nz]
> Sent: Sunday, April 01, 2001 2:56 PM
> To: "M. Edward (Ed) Borasky"
> Cc: R-help
> Subject: Re: [R] PICT output?
> |> PowerPoint, I assume you have Windows :-). I do the analysis
> on the Linux box
> |> and plot "png" files. They are fine for display, but they
> don't print very well.
> It's not necessary to resort to using Windows.  You can improve the
> printing quality of a png file by using the bitmap function, and
> increasing the res from the default 72 to something like 200.  Your
> png file will look fine in PowerPoint.  (It will look huge if you try
> to view it in a file viewer, though).
> Another down side is that the type of compression is quite processor
> intensive which can make it slow to appear in PowerPoint.  That might
> be reason to use WMF instead.

In fact, I am doing the Linux "png" output using "bitmap", "png16",
actually, with a resolution of 600 dpi. They look great on the screen, but
the Windows printer drivers translate them to something grainy and not at
all attractive. My recollection is that the biggest ones are about 90 KBytes
each at this resolution, and 1/4 that at 300 dpi. And yes, the *Linux*
viewers, at least the built-in ones, don't reproduce them as a single page
but just a small chunk of a page; you have to use a viewer with scrollbars
and zoom capability. That's not a problem for this application, because the
person viewing the pictures will *always* have a Windows system.

I discussed these issues a while back. My original design created ".eps"
output files, but I couldn't insert them as pictures in a Word document. So
I tried *all* the other possibilities on Linux before settling on "png" as
the most portable. If Linux R had ".emf" output, I would use that. But it
doesn't, and given my time constraints I did not have the option of
implementing a driver, and even if I did, it would remain proprietary to my
employer, and would not be contributable to the R community as a result.
M. Edward (Ed) Borasky, Chief Scientist, Borasky Research
http://www.borasky-research.net  http://www.aracnet.com/~znmeb
mailto:znmeb at borasky-research.com  mailto:znmeb at aracnet.com

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