Quote:
Originally Posted by retrography
Great idea. One tip: If you explode that PDF with poppler’s pdfimages, you can simply take the writing layer images and discard the rest (including the background template).
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Yeah, I though about trying to expand the PDF to see if I could do something like that. But luckily all the backgrounds are in some shade of grey, and so it's easy to use imagemagick to solve two problems with one command: convert to bitmap and exclude all non-black colours.