Re: [R] latex, eps graphics and transparent colors

From: Jim Lemon <>
Date: Thu, 14 Apr 2011 18:46:03 +1000

On 04/14/2011 03:30 AM, Michael Friendly wrote:
> I have a diagram to be included in latex, where all my figures are .eps
> graphics (so pdflatex is not an
> option) and I want to achieve something
> like the following: three concentric filled circles varying in lightness
> or saturation. It is easiest to do this using
> transparency, but in my test using the postscript driver, the
> transparent color fills do not appear. Is it
> correct that postscript() does not support transparency?
> circle <-function (radius = 1, segments=61) {
> angles <- (0:segments)*2*pi/segments
> radius * cbind( cos(angles), sin(angles))
> }
> plot(1:5, 1:5, type='n', xlim=c(-1,5), ylim=c(-1,5), xlab='', ylab='',
> asp=1, xaxt="n", yaxt="n")
> #clrs <- trans.colors("lightblue", alpha=c(.2, .4, .6)) ## from heplots
> package
> clrs <- c("#ADD8E633", "#ADD8E666", "#ADD8E699")
> c1 <- circle(3)
> polygon( c1, col=clrs[1], border="lightblue")
> polygon(.67*c1, col=clrs[2], border="lightblue")
> polygon(.33*c1, col=clrs[3], border="lightblue")
> arrows(-1, 0, 5, 0, angle=10, length=.2, lwd=2, col="darkgray")
> arrows( 0, -1, 0, 5, angle=10, length=.2, lwd=2, col="darkgray")
> One alternative that sort of works is to use the png() driver, and then
> convert fig.png fig.eps
> but I need very high resolution to make the real diagram legible.
> It might suffice to use hcl() colors to approximate what I've done with
> transparency,
> but I don't know how to start with a given color ("lightblue") and
> achieve roughly
> similar resuts.
Hi Michael,
For a "one off" job, I would probably do the transparent overlays in the pdf device, open the result in xpdf or Acrobat and then use the GIMP to identify the resulting colors from a screen shot. Then redo the plot in the postscript device using the opaque colors. This is only an approximation, of course, but it gets the job done.

Jim mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Thu 14 Apr 2011 - 08:50:43 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 14 Apr 2011 - 10:30:28 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.

list of date sections of archive