Re: [R] PowerPoint - eps not suitable

From: Marc Schwartz (via MN) <mschwartz_at_mn.rr.com>
Date: Sat 24 Jun 2006 - 04:43:54 EST

On Fri, 2006-06-23 at 14:02 -0400, Michael H. Prager wrote:
> Previous posters have argued for EPS files as a desirable transfer
> format for quality reasons. This is of course true when the output is
> through a Postscript device.
>
> However, the original poster is making presentations with PowerPoint.
> Those essentially are projected from the screen -- and screens of
> Windows PCs are NOT Postscript devices. The version of PowerPoint I
> have will display a bitmapped, low-resolution preview when EPS is
> imported, and that is what will be projected. It is passable, but much
> better can be done!
>
> In this application, I have had best results using cut and paste or the
> Windows metafile format, both of which (as others have said) give
> scalable vector graphics. When quirks of Windows metafile arise (as
> they can do, especially when fonts differ between PCs), I have had good
> results with PNG for line art and JPG for other art.
>
> Mike

Just so that it is covered (though this has been noted in other threads), even in this situation, one can still use EPS files embedded in PowerPoint (or Impress) presentations.

The scenario is to print out the PowerPoint presentation to a Postscript file (using a PS printer driver). If you have Ghostscript installed, you can then use ps2pdf to convert the PS file to a PDF file.

If you have OO.org, there is a Distiller type of printer driver called PDF Converter (configured via the printer admin program) available, which you can use to go directly to a PDF in a single step. This also uses Ghostscript (-sDEVICE=pdfwrite) as an intermediary (though hidden from the user) step.

The standard OO.org PDF export mechanism (using the toolbar icon) only exports the bitmapped preview, not the native EPS image. This is what you see as the preview image in these "Office" type of apps by default.

Most PDF file viewers (Acrobat, xpdf, Evince, etc.) have a full screen mode, whereby you can the use the viewer to display the presentation in a landscape orientation to an audience.

I have done this frequently (under Linux with OO.org) to facilitate presentations, when for any number of reasons, using LaTeX (ie. Beamer) was not practical.

Even when using Beamer, the net result is still the same: creating a PDF file via pdflatex, which is then displayed landscape in a PDF rendering application full screen.

This was the typical mode of operation at last week's useR! meeting in Vienna.

All that being said, the ultimate test is in the eye of the user. So whatever gives you sufficient quality for your application with minimal hassle is the way to go.

HTH, Marc Schwartz



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