How to really (!) compress embedded pictures?

I have a big, big pdf doc with mostly embedded pictures.
Now I want to compress the whole pdf doc up to 10-20% of the original size.
There are some so-called "pdf compressor" tools out there.
I tried a couple of them but the pdf doc is NOT getting much smaller (10.1 MB->9.9 MB)
So I am still searching for real (!) pdf compressor which is able to compress the embedded pictures.
If these pictures were stored as (uncompressable) *.png images then the compressor should be able
to convert them to *.jpg and compress them even more.
Does someone know such a tool?
Peter

I think your question would be better answered in the Acrobat forum, for discussion about its "PDF Optimizer" feature rather than here which is about the technical details of the PDF file format.
But since you raised it here, I will point out that PDF supports MANY DIFFERENT compression formats for images - both lossless (eg. Flate, LZW, JPEG2000, JBIG2, CCITT, etc.) as well as lossy (eg. JPEG/DCT, JPEG2000, JBIG2).  In addition, PDF supports technologies such as segmentation, layering and like which are commonly used in image compression strategies.

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