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pts / pdfsizeopt

PDF file size optimizer
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Processing deflated CCITT to JBIG2 "/ Filter /FlateDecode /CCITT" to "/Filter /JBIG2" #128

Open maadjordan opened 5 years ago

maadjordan commented 5 years ago

To add processing deflated CCITT stream to JBIG2 encoding.

rbrito commented 5 years ago

First of all, sorry for the short email, but I am on vacation, away from my computer.

With that being said, pdfsizeopt does not perform some optimizations. I don't recall (and can't experiment right now) with files with multiple compressions, but one excellent option is to use qpdf prior to uncompress files prior to using pdfsizeopt.

I frequently get some weird PDFs that I want to keep, but they are weirdly produced and qpdf sort of "normalizes" them in a way that pdfsizeopt likes.

Just my 2 cents,

Rogério Brito

Em qui, 25 de jul de 2019 10:38, maadjordan notifications@github.com escreveu:

To add processing deflated CCITT stream to JBIG2 encoding.

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maadjordan commented 5 years ago

001-022_original.pdf 001-022_pso.pdf 001-022_foxit_phantom.pdf

I've add samples to review were CCTT streams are not transferred to Jbig2

pts commented 4 years ago

I can't reproduce this bug, for me pdfsizeopt creates a PDF with images having /Filter/JBIG2Decode, see the attached file.

Please upgrade to the latest pdfsizeopt, try again, and if you still get the problem, then copy-paste the full console output of pdfisizeopt, and reopen this issue.

use qpdf prior to uncompress files prior to using pdfsizeopt

This is a useful general trick (e.g. for password-protected PDFs), but it's not necessary for images.

001-022_original.pso.pdf

maadjordan commented 4 years ago

i found the cause of it. i used multivalent and once i omit it is working fine.

pts commented 1 year ago

You may want to upload a test input PDF and a pdfsizeopt command-line with Multivalent. Maybe it's possible to make pdfsizeopt autodetect the situation, and prevent Multivalent from touching the image.