From: Roland Hieber Date: Thu, 20 Feb 2014 10:01:42 +0000 (+0100) Subject: amend blag post about optimizing PDFs (added convert -page A4) X-Git-Url: https://git.rohieb.name/www-rohieb-name.git/commitdiff_plain/388d33a0be9a09e32529a0451c1554f764bfab70 amend blag post about optimizing PDFs (added convert -page A4) --- diff --git a/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn b/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn index e48c024..7a0cd60 100644 --- a/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn +++ b/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn @@ -334,6 +334,13 @@ in X and Y direction, which was the resolution at which the images were scanned: $ convert image*jpg -density 200x200 document.pdf +*Update:* You can also use the [`-page` parameter][page] to set the page size +directly. It takes a multitude of predefined paper formats (see link) and will +do the pixel density calculation for you, as well as adding any neccessary +offset if the image ratio is not quite exact: + + $ convert image*jpg -page A4 document.pdf + With that approach, I could reduce the size of my PDF from 250 MB with losslessly compressed images to 38 MB with DCT compression. @@ -368,5 +375,6 @@ document. [scan-to-pdfa]: http://blog.konradvoelkel.de/2013/03/scan-to-pdfa/ "Konrad Voelkel: Linux, OCR and PDF: Scan to PDF/A" [pdf-stream-objects]: http://blog.didierstevens.com/2008/05/19/pdf-stream-objects/ "Didier Stevens: PDF Stream Objects" [pdf-tools]: http://blog.didierstevens.com/programs/pdf-tools/ "Didier Stevens: PDF Tools" +[page]: http://www.imagemagick.org/script/command-line-options.php#page "ImageMagick: Command-line Options" [[!tag PDF note_to_self howto ImageMagic convert file_formats reference longpost]]