On Jan 18, 2012, at 5:22 PM, Steven McKinney wrote:
>
> Hi all,
>
> I have been having problems generating png files on a Mac running OS X
> 10.6.8.
>
> Here's a simple example
>
>> png("foo.png", type = "cairo"); plot(1:10); dev.off();
> null device
> 1
> libpng warning: Application built with libpng-1.2.26 but running with 1.5.2
>
> The resultant file is of size 0 Kb.
>
> Is this the proper place to report this issue? Or should this
> be reported to r-sig-mac?
>
yes
> If I run
>
>> png("foo.png"); plot(1:10); dev.off();
> null device
> 1
>
> I get a 16 Kb file with the appropriate plot. (Odd, since the default type
> is "cairo".)
>
No, the default is "quartz" unless you change it in your options.
On a similar note type="cairo-png" works as well.
The problem seems to be with R's configuration - for some mysterious reason it
picks libpng12 flags even though cairo clearly includes libpng15 (and so does
pkg-config). I'll need to dig a bit into that.
Cheers,
Simon
> Whenever I see the libpng warning, I end up with a 0 Kb file.
>
> Details of R session below.
>
>
> Regards
>
> Steve McKinney
>
>
>
> R version 2.14.1 Patched (2012-01-11 r58090)
> Copyright (C) 2012 The R Foundation for Statistical Computing
> ISBN 3-900051-07-0
> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>
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> You are welcome to redistribute it under certain conditions.
> Type 'license()' or 'licence()' for distribution details.
>
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> Type 'q()' to quit R.
>
> [R.app GUI 1.44 (5997) x86_64-apple-darwin9.8.0]
>
> [History restored from /Users/stevenmckinney/.Rhistory]
>
>> png("foo.png"); plot(1:10); dev.off();
> null device
> 1
>> png("foo.png", type = "cairo"); plot(1:10); dev.off();
> null device
> 1
> libpng warning: Application built with libpng-1.2.26 but running with 1.5.2
>> ?png
> starting httpd help server ... done
>> capabilities()
> jpeg png tiff tcltk X11 aqua http/ftp sockets
> libxml fifo
> TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
> TRUE TRUE
> cledit iconv NLS profmem cairo
> TRUE TRUE TRUE TRUE TRUE
>> png("foo.png"); plot(1:10); dev.off();
> null device
> 1
>> sessionInfo()
> R version 2.14.1 Patched (2012-01-11 r58090)
> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>
> locale:
> [1] en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> loaded via a namespace (and not attached):
> [1] tools_2.14.1
>>
>
>
> Steven McKinney, Ph.D.
>
> Statistician
> Molecular Oncology and Breast Cancer Program
> British Columbia Cancer Research Centre
>
> email: smckinney +at+ bccrc +dot+ ca
>
> tel: 604-675-8000 x7561
>
> BCCRC
> Molecular Oncology
> 675 West 10th Ave, Floor 4
> Vancouver B.C.
> V5Z 1L3
> Canada
>
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