R devel - Jan 2012 - Failure to get compactPDF to compact a pdf file

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?

I have also tried recreating the pdf file.  I also tried
R CMD build --resave-data --compact-vignettes DAAG

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")
> dir('/Users/johnm/packages/DAAG/inst/doc/')
[1] "rockArt.pdf"
> sessionInfo()
R version 2.14.1 (2011-12-22)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] 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.
http://www.maths.anu.edu.au/~johnm

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")
>> dir('/Users/johnm/packages/DAAG/inst/doc/')
> [1] "rockArt.pdf"
>> sessionInfo()
> R version 2.14.1 (2011-12-22)
> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>
> locale:
> [1] C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> loaded via a namespace (and not attached):
> [1] 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.
> http://www.maths.anu.edu.au/~johnm
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel

-- 
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