06-14-2019, 09:25 PM | #1 |
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Pdf compression options in Ghostscript?
Hi,
I am looking for options to speed up my pdfs so they load faster on the Kindle Dx and never crash it. I already convert to version 1.4, either using Ghostscript or Willus' k2pdfopt. I am trying to optimize for compatibility, and then speed, not file size, so jpeg-2000 is not an option. 1. Conversion with Compression, older system I used to use the following to pre-process some pdfs for older Kindle compatibility. I mostly ran it in Apple's Automator for drag-and-drop w/o extra typing, but that requires different syntax. It had the side effect of compressing images, and sometimes obscuring pages which had been wrong rendered as images: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf I think I can get milder compression with: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf based on these instructions, but reversing the polarity: http://www.spoonylife.org/level-3/co...to-1-5-1-6-etc 2. Conversion without Compression I currently use the following. I mostly run it in Apple's Automator for the same reason, but that requires different syntax. It avoids obscuring pages, but it sometimes leaves a lot of large images which slow down, freeze, or even crash my Kindle Dx: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf 3. Text-Only, unreliable I also experimented with variations on the following, but it would lose scale on pages and lose real text as well as images: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dFILTERIMAGE -dFILTERVECTOR -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf 4. Conversion with compression, is there a new system? Current Ghostscript documentation such as "How to use Ghostscript" avoids mentioning -dPDFSETTINGS or listing the options: https://www.ghostscript.com/doc/current/Use.htm But they do mention the extremely buggy and even more aggressive -dFILTERIMAGE and -dFILTERVECTOR, so is there some problem with -dPDFSETTINGS where they want to discourage use short of dropping the function...? And is there another option replacing -dPDFSETTINGS? |
06-15-2019, 01:44 PM | #2 |
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I'm getting crashes on =ebook so I guess it's better to go back to =screen, unless anyone knows of better compression options...?
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ghostscript, pdf |
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