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undesired grid in ps/eps outputs generated by filled.contour or image
2 messages · Rachel Albrecht, Marc Schwartz
on 02/06/2009 01:32 PM Rachel Albrecht wrote:
Hi!
Whenever I save a graphic in ps/eps format generated by filled.contour or
image, an undesired grid is added to it (not visible on the X11 screen). For
example:
postscript("volcano.eps")
filled.contour(volcano,col=gray(seq(0,1,,50)),levels=seq(min(volcano),max(volcano),,50))
dev.off()
Any ideia how to eliminate this grid?
Thanks,
Rachel
I can confirm the problem, running: R version 2.8.1 Patched (2009-01-24 r47726) on Fedora 10. The problem is actually worse if using the pdf() device, with additional artifacts present. There was a posting about this back in 2003: https://stat.ethz.ch/pipermail/r-help/2003-August/037348.html with no replies. There is a bug report here from 2004: http://bugs.r-project.org/cgi-bin/R/Graphics?id=6763 that seems to be related. So it seems the issue has been around for a while. I tried increasing the granularity of the color scale, though without any benefit. Will have to defer to the graphics device wizaRds on this one. Marc Schwartz