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Are there any open-source command line tool for optimizing PDF in Ubuntu. I have used Ghost Script and i am able to convert the PDF into 72 dpi,

gs -sDEVICE=pdfwrite \
   -dCompatibilityLevel=1.4 \
   -dPDFSETTINGS=/screen \
   -dNOPAUSE -dQUIET -dBATCH \
   -sOutputFile=myOutput.pdf myInput.pdf

But what i would like to do is mention what dpi i want to convert the PDF to, like a 300 dpi PDF file to 90 dpi PDF file.

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3
  • Welcome to Ask Ubuntu! Your question was migrated here from Stack Overflow. Please register on this site, too, and make sure that both accounts are associated with each other, otherwise you won't be able to comment on or accept answers or edit your question.
    – N.N.
    Sep 28, 2011 at 12:26
  • Maybe you should rephrase your question since optimizing pdfs might be confused with linearizing them which is not what you're asking for.
    – N.N.
    Sep 28, 2011 at 12:27
  • Please see this related Q&A for a number of GUI tools that can help you with optimizing your PDF files.
    – Glutanimate
    Apr 11, 2013 at 21:37

1 Answer 1

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9

I'll quote zweifel's comment on http://www.ubuntugeek.com/ubuntu-tiphowto-reduce-adobe-acrobat-file-size-from-command-line.html:

  • dPDFSETTINGS=/screen (screen-view-only quality, 72 dpi images)
  • dPDFSETTINGS=/ebook (low quality, 150 dpi images)
  • dPDFSETTINGS=/printer (high quality, 300 dpi images)
  • dPDFSETTINGS=/prepress (high quality, color preserving, 300 dpi imgs)
  • dPDFSETTINGS=/default (almost identical to /screen)

More options and fine tunning on the site: http://milan.kupcevic.net/ghostscript-ps-pdf/

Thus you should use either the option dPDFSETTINGS=/printer or the option dPDFSETTINGS=/prepress to get 300 dpi.

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  • Unfortunately, this will not replace multiple instances of the same graphic with a single reference.
    – vy32
    Nov 6, 2013 at 22:27

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