Thank you for your reply.

Martin Petricek, 30/07/2011 11:45:
> You can try using pdfimages with -j parameter, which will (if the image
> is stored with jpeg compression) save them as JPEG, thus avoiding
> recompression, which will increase the size.

Yes, that's what we first thought.

> Or you can try writing custom script for pdfedit that will look in the
> content stream. Based on how does the watermark look in the content
> stream it may be anything between easy and almost impossible (depending
> how hard is for the script to distinguis the watermark images between
> the images you want to keep :)
> But from the dump of the stream it looks the watermark have always the
> same size, so it should be quite easy.

Quite impossible at least for me, yes. :-)
In fact in the meanwhile they're being uploaded as extracted JPG: 
<http://www.archive.org/search.php?query=subject%3A%22Philosophical+Transactions+of+the+Royal+Society%22>

> Can you send me one of these documents (not to list but to my email), so
> I may have a look at it without downloading the whole archive?

I will. Anyway the last archive in the torrent (11.7z) is only ~200 
KiB). :-)

Federico

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