Hi Mark, I assume you’re using a Mac. This problem comes from the way Quartz renders immediately adjacent filled polygons. To get around it, you can add type=“cairo” or type=“Xlib” as an argument to the tiff, png, or jpeg call. If you really want to make a PDF, I can post those instructions to the list, but it is a bit more involved and uses some custom code I’ve written.
Cheers, Colin PS: I would avoid cross-posting to multiple lists in the future. That’s generally frowned upon. > On Nov 5, 2014, at 4:14, M P <[email protected]> wrote: > > Hello, > I cannot fix image quality e.g. generated with filled.contour(). Whether I > use tiff, png, jpeg, or pdf I always see vertical and horizontal lines at > every grid increment on the plots like the attached. There is no problem when > I plot in x11. > How to fix that? > Thanks, > Mark _______________________________________________ R-SIG-Mac mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-mac
