[Rd] Failure to get compactPDF to compact a pdf file
john.maindonald at anu.edu.au
Tue Jan 24 22:22:55 CET 2012
Quoting from the R-2.14.1 help page for compactPDF:
This by default makes use of 'qpdf', available from <URL:
http://qpdf.sourceforge.net/> (including as a Windows binary) and
included with the CRAN Mac OS X distribution of R. If 'gs_cmd' is
non-empty, GhostScript will used instead.
The defaults are:
compactPDF(paths, qpdf = Sys.getenv("R_QPDF", "qpdf"),
gs_cmd = Sys.getenv("R_GSCMD", ""),
gs_quality = c("printer", "ebook", "screen"),
gs_extras = character())
> Sys.getenv("R_QPDF", "qpdf")
> Sys.getenv("R_GSCMD", "")
Thus, as far as I can see, compactPDF is set up (on my system) to use qpdf to compress.
I take it then that the "Writing R Extensions manual [2.14.1 (2011-12-22)] is anticipating what is in R-devel:
The --compact-vignettes option will run tools::compactPDF over the PDF files in inst/doc (and its subdirectories) to losslessly compress them. This is not enabled by default (it can be selected by environment variable _R_BUILD_COMPACT_VIGNETTES_) and needs qpdf(http://qpdf.sourceforge.net/) to be available.
John Maindonald email: john.maindonald at anu.edu.au
phone : +61 2 (6125)3473 fax : +61 2(6125)5549
Centre for Mathematics & Its Applications, Room 1194,
John Dedman Mathematical Sciences Building (Building 27)
Australian National University, Canberra ACT 0200.
On 24/01/2012, at 11:22 PM, Prof Brian Ripley wrote:
> On 24/01/2012 08:30, John Maindonald wrote:
>> I am failing to get compactPDF to make any change to a pdf file
>> that, a/c to the message from the CRAN upload site, can be very
>> substantially compacted. Any ideas what may be wrong?
> AFAICS you are quoting a message from R-devel, which tries to find 'gs' for you. In R 2.14.1 you need to tell compactPDF where it is (assuming you do have it installed): see its help.
>> I have also tried recreating the pdf file. I also tried
>> R CMD build --resave-data --compact-vignettes DAAG
> Again, in R-devel you can do R CMD build --compact-vignettes=gs (assuming that is in your path or R_GSCMD is set), but not in R 2.14.1.
> But I have already told you directly (and been ignored) that the problem is the excessive resolution of the embedded bitmap image which needs to be down-sampled.
>> The data files compact alright (but I get the 'significantly better compression'
>> warning message that might suggest that this is not happening), but the pdf
>> file appears to go into the package unmodified.
>>> tools::compactPDF('/Users/johnm/packages/DAAG/inst/doc/', gs_quality = "ebook")
>>  "rockArt.pdf"
>> R version 2.14.1 (2011-12-22)
>> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>>  C
>> attached base packages:
>>  stats graphics grDevices utils datasets methods base
>> loaded via a namespace (and not attached):
>>  tools_2.14.1
>>> From the Unix command line:
>> jhm:doc johnm$ ls -lt /Users/johnm/packages/DAAG/inst/doc
>> total 1368
>> -rw-r--r--@ 1 johnm staff 696762 2 Aug 12:35 rockArt.pdf
>> Message from the CRAN upload site:
>> * checking sizes of PDF files under ‘inst/doc’ ... NOTE
>> ‘gs’ made some significant size reductions:
>> compacted ‘rockArt.pdf’ from 680Kb to 58Kb
>> consider running tools::compactPDF(gs_quality = "ebook") on these files
>> John Maindonald email: john.maindonald at anu.edu.au
>> phone : +61 2 (6125)3473 fax : +61 2(6125)5549
>> Centre for Mathematics& Its Applications, Room 1194,
>> John Dedman Mathematical Sciences Building (Building 27)
>> Australian National University, Canberra ACT 0200.
>> R-devel at r-project.org mailing list
> 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 272866 (PA)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
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