As a user I like to know what happens inside things.

I would like a combo-box in "preferences" giving the following choices for 
saving to pdf:
1) Jpeg or zlib (smallest one chosen for each image) -> default
2) Jpeg only (lossy)
3) Zlib only (lossless)

Your proposition is much simpler, however it remains opaque to users.

It depends on the audience you target.

Note: I just installed everything to disable jpeg compression in a local
build (quick hack) and debug the program. It is my first time with Vala
+ Gtk. So we may have more technical discussion now.

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https://bugs.launchpad.net/bugs/1886279

Title:
  simple-scan pdf compression

Status in simple-scan package in Ubuntu:
  Incomplete

Bug description:
  Hello,

  PDF compression cannot appropriately be configured.

  Having taken a look at the latest source code of simple-scan:
  1) simple-scan compresses each image in ZLIB or JPEG depending on the 
compressed size (it keeps the ZLIB version if it is smaller than the JPEG)
  2) the "quality" setting only applies to JPEG

  With this in mind, I think it is impossible to use simple-scan to
  create a PDF full of lossless ZLIB images for archiving documents
  where we want to keep quality at the expense of the size.

  Best regards

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