On Tue, 2007-07-31 at 10:22 -0600, D. R. Evans wrote: > I am not understanding something about generating PNG plots. > > I have tried several ways to obtain something other than a transparent > background, but nothing I've done seems to change the background. > > For example: > > dev.print(png, width=800, height=600, bg='red', filename='example.png') > > which I thought would give a red background, simply gives the same > transparent background I always get.
?dev.print says: 'dev.print' copies the graphics contents of the current device to a new device which has been created by the function specified by 'device' and then shuts the new device. Note "copies" - given that you've already drawn a figure with a white background, should this then produce one that is red? However, you are correct that it does produce a plot with a transparent background. I find it easier to wrap my plotting commands in the relevant device, e.g. this works with the desired background: > png("mypng.png", height = 400, width = 400, bg = "red", pointsize = 12) > plot(1:10) > dev.off() Whereas these do not give "red" backgrounds as one might have expected, but transparent ones: > plot(1:10) > dev.print(png, height = 400, width = 400, bg = "red", pointsize = 12, filename = "mypng2.png") X11 2 > dev.copy(png, height = 400, width = 400, bg = "red", pointsize = 12, filename = "mypng3.png") PNG 3 > dev.off() X11 2 Not sure whether this is as intentional or not, but it does not appear to be passing the bg argument on to the 'device', or if it does, it is not being used/respected - perhaps all that is need is clarification as to what can be specified in '...' in ?dev.print > version _ platform i686-pc-linux-gnu arch i686 os linux-gnu system i686, linux-gnu status Patched major 2 minor 5.1 year 2007 month 07 day 05 svn rev 42131 language R version.string R version 2.5.1 Patched (2007-07-05 r42131) G > > And I also don't understand why the default background is transparent, > when the documentation seems to say that it's white: > png(filename = "Rplot%03d.png", width = 480, height = 480, > pointsize = 12, bg = "white", res = NA,...) > > (This is on a Kubuntu dapper 64-bit system.) > > [I looked through the mail archives, and there seem to be a few very > old postings talking about the opposite problem, but nothing recent; > so I conclude that I'm doing something wrong.] > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.