On Fri, Mar 12, 2010 at 9:52 PM, Bob Green <bgr...@dyson.brisnet.org.au> wrote: > > I have to create a plot with a print density of 600 dpi . Within R, is there > a way to determine the print density of a plot? > > Any assistance is much appreciated,
A PostScript, embedded PostScript, or PDF file has essentially infinite dpi, since it is a vector representation. If you create a raster representation, such as with the png graphics device, then the dpi is going to depend on the final size of the plot in inches and the pixel size of the image. This png device call will create a png image that is 1800x1800 pixels: png(width=3,height=3,units="in",res=600) If you expand that to a 6x6inch final image on paper, it'll be 300 dpi. Print it on a full page of A0 and the dpi will be small enough for you to see the individual pixels as blocks. The printer may still be doing 600 dots per inch though. So I think the solution, when someone says "We need these figures at 600dpi", is to ask them how big in inches they want them, then use the png() device. I've sometimes had people insist on 600dpi resolution images, but then not have a clue what final size the image is going to be. Barry ______________________________________________ R-help@r-project.org 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.
