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
: [R] Using an image background with graphics
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 example, a color
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
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 example, a color contour plot would have
an gray-toned aeri
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