Extend a GIMP script

I have a GIMP script that makes PDFs look like scanned. So far however, it only processes the first page of a PDF and ignores the others. Besides, the output is sometimes quite big. I'd like you to change my script so that: - It processes all pages of a PDF - It reduces the size of the output a bit (there should be some way to lower the resolution?) The script is appended, to see where it is used and what the current limitations are, see [login to view URL] [login to view URL]