[R-SIG-Mac] image() to Rplot.pdf
simon.urbanek at r-project.org
Tue Jan 20 16:40:48 CET 2009
On Jan 20, 2009, at 9:56 , Paul J. Ossenbruggen wrote:
> Hi Simon,
> Thank you for the information about the R image rendering issue in
> Preview and Acrobat. I am happy to learn that my problem is not
> related to R and Quartz.
> As you suggested, I zoomed in and out with Preview but the white
> lines did not disappear entirely. However, this is OK for the type
> of analysis that I have performed.
> The real problem that I have is converting it to a tiff file. I
> must submit a tiff file to the journal where the image will be
> published. When I use Preview for conversion, the image looks like a
> Scottish plaid. The white lines are there but they look they are
> part of the plaid.
> Acrobat, on the other hand, is totally unacceptable. The image
> shading disappears entirely and a series of dots appear within the
> map boundary. The legends have no shading what so ever, thus
> converting it to a tiff file won't work. I have successfully use
> this method for transforming color R images in pdf to tiff.
> Question: Is it possible to export or convert a R image directly to
> a tiff file without going Preview?
Sure, that's easily done using Quartz directly:
For a journal you may want to increase the dpi, e.g.:
Since Quartz knows that you're generating a bitmap it will snap the
pixel boundaries for rectangles accordingly.
If you don't want a transparent background, you can use Quartz
directly to do the drawing and force bg="white":
# do your plotting here ... (you can also set width/height above see ?
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