Paul,
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:
quartz.save("foo.tiff",type="tiff")
For a journal you may want to increase the dpi, e.g.:
quartz.save("foo.tiff",type="tiff",dpi=300)
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":
quartz(file="foo.tiff",type="tiff",dpi=300,bg="white")
# do your plotting here ... (you can also set width/height above see ?
quartz)
dev.off()
Cheers,
Simon
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