Dr. Ripley,
Thank you, yes, it's the anti-aliasing thing again. I'm using Redhat
EL4, R-2.8.0, and pdf(). I had the problem with images displayed in
xpdf, even with xpdf -aa no. I do not get the problem in Adobe Reader
7.0 for Linux. I'll try harder to remember this point.
Scott Waichler
Pac
Most likely this is a bug in your pdf viewer: try turning off
anti-aliasing there (or use a better viewer, if that is not an option).
It is a symptom of anti-aliasing of the rectangles used to plot image
pixels.
You haven't told us which 'a pdf device' and there are several for R,
depending on
Greg,
> The rimage package has functions for reading in and plotting
> jpeg files that you could use for displaying the photograph.
> If you then can find 2 points in the image (not on the same
> horizontal or vertical line) for which you know the
> coordinates in the coordinate system that y
The rimage package has functions for reading in and plotting jpeg files that
you could use for displaying the photograph. If you then can find 2 points in
the image (not on the same horizontal or vertical line) for which you know the
coordinates in the coordinate system that you want to plot in
On Monday 13 October 2008, Waichler, Scott R wrote:
> I would like to use a map or aerial photo as a background to plotting
> solid lines and text, and semi-transparent color contours, in base and
> lattice graphics. Plot coordinates need to be consistent with the
> georeferenced background. For
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