This requires the installation of Python and pyPDF. Out of the gate, the script does not provide for image overlap, however there is a patch that does fix this. The patch requires replacing 5-6 lines in 3 files and adding 2-3 new ones, its very easy. The patch is here: http://pdfposter.origo.ethz.ch/node/39 . Also note this program requires the installation of Python 2.5. If you just have Python 2.4, you will get errors.