On Wed 02 Jan 2019 at 22:50:10 (-0500), kamaraju kusumanchi wrote: > On Wed, Jan 2, 2019 at 6:33 AM Jörg-Volker Peetz <jvpe...@web.de> wrote: > > > > With the pdf-files from my Canon scanner, I did shrink them with the help of > > ghostscript: > > > > $ ps2pdf old.pdf new.pdf > > > > This does not help. The file sizes are more or less the same (if > anything, they are slightly larger).
That's my usual experience too. However, I looked around for an old PDF and found a magazine distributed by my old employer. I could halve the file size as above. Looking at the original, there's a lot more legible XML (like image metadata) though it's difficult to tell if that accounts for the difference. I think it was produced on a Mac; most of the images certainly were. $ pdfinfo /tmp/original.pdf Creator: Adobe InDesign CS3 (5.0.2) Producer: Adobe PDF Library 8.0 CreationDate: Thu May 1 05:47:22 2008 CDT ModDate: Thu May 1 06:21:43 2008 CDT Tagged: no UserProperties: no Suspects: no Form: AcroForm JavaScript: no Pages: 48 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 7297299 bytes Optimized: no PDF version: 1.6 $ pdfinfo /tmp/new.pdf Creator: Adobe InDesign CS3 (5.0.2) Producer: GPL Ghostscript 9.26 CreationDate: Wed Jan 2 22:21:22 2019 CST ModDate: Wed Jan 2 22:21:22 2019 CST Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 48 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 3769525 bytes Optimized: no PDF version: 1.4 $ Cheers, David.
