The bitmap() device does not support transparency. The png() device does. On Thu, 29 Jul 2004, Patrick Connolly wrote:
> The result I'm aiming to achieve is a bitmap that can be imported into > a PowerPoint file that shows what's behind the lines of the plot. > There's a way in PowerPoint that almost works. By choosing a colour > to set as transparent, what is behind the graphic is indeed visible, > but it's at the expense of losing line and text definition. > > I notice there have been discussions about transparent backgrounds > mostly with lattice plots. The problem most people seem to have was > getting a blue background when they wanted a white one. > > Mine is the reverse (and I'm using standard graphics, not Lattice). > I'm trying to get a transparent background but it always comes out > white. Setting bg = "transparent", I've tried using a bitmap device > to create a png file. I've also tried creating a postscript file and > converting it to a PNG file using the Gimp. I've always used a > resolution of 300 dpi in bitmaps since the default is far too low. Really? You want PNG files of 2000+ pixels in each dimension? (The standard size of an R plot is 7", and at 72dpi that is a reasonable size for on-screen use -- and you should not really be using bitmapped files for other uses.) -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
