If you find youself struggeling with exporting images from PDFs, don’t give up, there is a solution
… if you’re in my situation (no desire to use Adobe’s bloat) or you just need a small handy command line tool for linux (or other “unixes”): try pdfimages. It’s part of the xpdf package, which is probably available for all major linux distributions.
Usage is very straightforward:
pdfimages -j foo.pdf bar
You can read the rest of the article on Stefaan Lippens Blog.