No, it means what it actually says. If you include R's PDF in another application, the latter will usually compress *if you asked the application for compressed PDF*.
On Thu, 2 Mar 2006, Hin-Tak Leung wrote: > Roger D. Peng wrote: >> The following paragraph from ?pdf struck me as a bit odd: >> >> 'pdf' writes uncompressed PDF. It is primarily intended for >> producing PDF graphics for inclusion in other documents, and >> PDF-includers such as 'pdftex' are usually able to handle >> compression. >> >> Should that be "...and PDF-includers such as 'pdftex' are usually _un_able to >> handle compression" ? > > Hmm, I think the documentation is correct but incomplete - pdftex *can* > handle compression, but compression is not implemented in R's pdf > output device. So it should say: > > "... PDF-includers such as 'pdftex' are usually able to handle > compression, but R's pdf device does not utilise that feature of pdf." > > (I have checked a pdf generated by R, and it doesn't compress, and I was > using pdflatex this morning to include a compressed pdf, so both > parts are correct). > > There is a caveat: the PDF specs (and the postscript language standard) > actually defines a few stream compression schemes - LZW and deflate > are two I know of from the top of my head, I think there are more. > But LZW used to be tangled up with the Unisys patent until recently > when the patent expired, so most open-source softwares won't do > it. deflate is implemented in zlib and ghostscript-written pdf > usually have stream compression on. i.e. For some purposes such > as getting smaller pdf's, it may be better to output from R > postscript and use ghostscript to do ps2pdf rather than doing > it directly from R, and to be pedantic, pdftex can only handle > deflate encoded compression, AFAIK, for the reason I outlined above, > but it is sufficient for most purposes, since most tools cannot > generate LZW-compressed pdf's. > > HTL > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > -- Brian D. Ripley, [EMAIL PROTECTED] 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 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
