I've got a PDF output file that has been generated by PowerPoint which has the slides on the left and lines for notes on the right side. The format is A4 and there are three slides per page. Now I'd like to print six slides per page without having the lines for notes on it (note: I don't have the PowerPoint-file).
I thought of cropping away half of the page and always merge two cropped pages to a complete one. I know, that this could be done using ghostscript but I don't have any clue how to do this.