Thanks Greg, Using rasterImage and the steps you described works fine! I agree with the distraction! But my purpose is to superimpose a heat map of eye tracking data on the original picture...
Thanks! ----- original message -------- Subject: RE: [R] plotting on an image Sent: Wed, 15 Jun 2011 From: Greg Snow<greg.s...@imail.org> > If you are willing to prepend a step then you could: > > 1. Create an empty plot using your data and type='n' (or just plot the data, > the points will be overwritten), you may want to set the asp argument, or > explicitly do the xlim and ylim arguments. > 2. Add the graphic using the rasterImage function > 3. Use functions such as points or lines (or others that add to existing > plots) to plot you data on top of the image. > > If you need certain points within the image to correspond to certain > coordinates then the locator and updateusr (TeachingDemos package) may be of > help. > > But in all of this, make sure that you really want to do this, often (but > not always) putting an image in the background is chartjunk that distracts > more than helps. > > -- > Gregory (Greg) L. Snow Ph.D. > Statistical Data Center > Intermountain Healthcare > greg.s...@imail.org > 801.408.8111 > > > > -----Original Message----- > > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > > project.org] On Behalf Of Johann Kim > > Sent: Monday, June 13, 2011 12:33 PM > > To: r-help@r-project.org > > Subject: [R] plotting on an image > > > > Hello all, > > > > has someone please a few hints about how to > > 1.st: draw an image (preferrably a jpg) and then > > 2nd: plot() on that image > > > > I am using a mac - and after searching and trying different ways (I > > have installed EBImage) I now would like to ask for help... > > > > Thanks! > > Johann > > ______________________________________________ > > 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. > --- original message end ---- ______________________________________________ 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.