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Is it possible to open a PDF with processing to display it within the program. I know it's simple to open images and vector graphics, but for some reason PDFs are not supported. I found a library to allow for exporting PDFs, but is there an option for importing?
The simplest way is to manually convert the PDF to SVG...
If you really need to open a PDF itself, see the http://forum.processing.org/one/topic/view-a-pdf.html thread.