Hi all! I encountered precision problems using pdf(). So far, I found out, that pdf() sets the Mediabox to even values in dtp points (1/72 inch). This can be seen in the following example. page.width <- 13.1/2.54 # in centimeters page.height <- 19/2.54 pdf(file = "foo.pdf", width = page.width, height = page.height) plot(0,0) dev.off() # The size of the Mediabox in foo.pdf is # /MediaBox [0 0 371 538] # but ist should be dtp.pt <- 1/72 page.width/dtp.pt # [1] 371.3386 page.height/dtp.pt # [1] 538.5827 Any ideas to cope with this problem. Thanks Roland