Dirk Eddelbuettel <[EMAIL PROTECTED]> writes: > a) if you must have png() as a format, you can start a virtual X11 server > with the xvfb server -- this is a bit involved, but doable; > > b) if you can do other formats instead of png(), this can work -- I have > forgotten the details but the story has been discussed many times over > here as web servers use the same "session-less" setup. In essence, > using ghostscript for the bitmap conversion works so it may be that > the bitmap() device works. If I recall pdf(), works. > > c) With that, you could try creating a pdf() first, and then use Perl to > call ghostscript to convert the pdf for you. R can do that too for > you, but only for certain devices.
d) Use bitmap(). It requires a working Ghostscript install, but is otherwise much more convenient. Newer versions of Ghostscript have some quite decent antialiasing built into some of the png devices. Currently you need a small hack to pass the extra options to Ghostscript -- we should probably add a gsOptions argument in due course. This works for me on FC3 (Ghostscript 7.07): mybitmap(file="foo.png", type="png16m", gsOptions=" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 ") where mybitmap() is a modified bitmap() that just sticks the options into the command line. There are definitely better ways... [The antialiasing is not quite perfect. In particular, the axes stand out from the box around plots, presumably because an additive model is used (so that if you draw a line on top of itself, the result becomes darker). Also, text gets a little muddy at the default 9pt @ 72dpi, so you probably want to increase the pointsize or the resolution.] -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
