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VincentYu comments on LessWrong Help Desk - free paper downloads and more (2014) - Less Wrong Discussion

30 Post author: jsalvatier 16 January 2014 05:51AM

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Comment author: VincentYu 06 October 2015 08:20:55AM 2 points [-]

it blew up to 14M

The object streams for indirect objects have been unpacked and stripped away, leaving their contents uncompressed. Use qpdf to regenerate compressed object streams:

qpdf --object-streams=generate in.pdf out.pdf

(The --stream-data=compress option is already set by default.)

While you are at it, might as well re-linearize the PDF for online readers with low bandwidth:

qpdf --object-streams=generate --linearize in.pdf out.pdf
Comment author: gwern 06 October 2015 04:01:49PM 0 points [-]

That seems to work. I tried gs, Gscan2pdf, and pdf2djvu but they all either didn't reduce size or segfaulted.

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