From 50357f354df45de8bda0d697370336d419dfeef6 Mon Sep 17 00:00:00 2001 From: Roland Hieber Date: Fri, 9 Jun 2023 10:09:42 +0200 Subject: [PATCH] blag: opmizing PDFs: add `-compress jpeg` note from Marcus --- blag/post/optimizing-xsane-s-scanned-pdfs.mdwn | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn b/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn index ccf9b42..5169a60 100644 --- a/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn +++ b/blag/post/optimizing-xsane-s-scanned-pdfs.mdwn @@ -344,6 +344,17 @@ offset if the image ratio is not quite exact: With that approach, I could reduce the size of my PDF from 250 MB with losslessly compressed images to 38 MB with DCT compression. +*Another update (2023):* Marcus notified me that it is possible to use +ImageMagick's `-compress jpeg` option, this way we can leave out the +intermediate step and convert PNM to PDF directly: + + $ convert image*.pnm -compress jpeg -quality 85 output.pdf + +You can also play around with the `-quality` parameter to set the JPEG +compression level (100% makes almost pristine, but huge images; 1% makes very +small, very blocky images), 85% should still be readable for most documents +in that resolution. + Too long, didn’t read ----------------- -- 2.20.1