Software required: gimp, pdftk.
First split the original pdf into separate pages (this is one disadvantage, pages need to be edited separately):
pdftk
- Import that page in gimp, using whatever dpi you want for any images you are adding (the higher the dpi, the better the quality. Try 300).
- The page will show up on a new (and only) layer. Do any modifications on separate layers (if you add text, gimp will automatically insert layers, but if you want to use brushes, make sure you create a new layer that you'll edit).
- When you're done, hide the background layer (the one with the PDF image), and print to a pdf file (say stamp1.pdf).
- Now, put the newly created pdf on top of the original page:
pdftk page1.pdf stamp stamp1.pdf
If your PDF was only one page, you're done. Otherwise, you should join all pages together:
pdftk page1.pdf page2.pdf [...] cat output output.pdf
Now all you need is a high-quality copy of your signature :)
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