quartz() and dpi
Hi, I think it's a bug in quartz(). The following example uses png() with cairo or quartz backends, and only cairo respects the size and resolution (as verified in Adobe Photoshop). png(file="foo-300.png", type="quartz", units="in",width=5, height=3, res=300) plot(1,1) dev.off() png(file="foo-300.png", type="cairo", units="in",width=5, height=3, res=300) plot(1,1) dev.off() As far as I can tell the Cairo device (CairoPNG) doesn't respect the size either. It looks like your best option is to switch between pdf() and png(type="cairo") using a wrapper like ggplot2::ggsave. Best, baptiste sessionInfo() R version 2.10.1 RC (2009-12-06 r50690) i386-apple-darwin9.8.0 locale: [1] en_GB.UTF-8/en_GB.UTF-8/C/C/en_GB.UTF-8/en_GB.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] Cairo_1.4-5 loaded via a namespace (and not attached): [1] tools_2.10.1
On 28 January 2010 02:23, JiHO <jo.lists at gmail.com> wrote:
Hello all,
I am using quartz (on OS X obviously) to produce PDFs and PNGs from my
plots, for later inclusion in LaTeX.
I am typically using something like:
plot(0)
dev.print(quartz, file="foo.pdf", width=5, height=3)
dev.print(quartz, file="foo.png", width=5, height=3, dpi=72)
I want the sizes of the PDF and PNG to be *equal* in *inches*, which
works with dpi=72. However, when I increase the dpi parameter, instead
of producing an image of the same size with increased resolution, it
creates a larger image of resolution = 72. E.g. try
dev.print(quartz, file="foo-72.png", width=5, height=3, dpi=72)
dev.print(quartz, file="foo-300.png", width=5, height=3, dpi=300)
system("open -a Preview.app foo-*.png")
The inspector in Preview should show 72 dpi for both files. This is with:
sessionInfo()
R version 2.10.1 (2009-12-14) x86_64-apple-darwin9.8.0 Is this a know bug/limitation? Is a solution planned? Is there a workaround for now? As a final note, I am aware that PDF is superior to PNG, particularly in a LaTeX workflow; but for particularly complex plots, I sometimes fall back on high resolution PNGs. Currently it forces me to add a 'scale' argument to includegraphics in latex for those. I would rather leave the latex document alone, use extension-less file names includegraphics and decide from R wether to produce a pdf or a png. Thank you in advance, JiHO --- http://maururu.net
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