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This may be of interest re: PDFs.
We recently, maybe 10-11 months ago, bought a very high end office printer/scanner, since we scan over 5000 pages/week and keep/db/archive them all.

The new printer scans at 60 pages per minutes from both sides of A4 paper at once-300-600 dpi.
We use 300 dpi full colour for everything.

The most important discovery.
The printer uses a dedicated hw processor to compress PDF files.
Its a pipeline, and hw scanning, printing, and compressing are complely independent processes than run in parallel.

The new printer make a 30-40 page document, scanned at 300 dpi, full colour, about 3-4 MB in size.
SW-compressed PDF files, 30 pages, 300 dpi, are typically about 20-30 MB.
So the best tech. makes PDF files 10x smaller, at better quality !!

Tested with exact same 2 docs, via sw and hw.

Quality is at least as good, perhaps better, with the new hw scanning/compressing, vs sw compressed pdf files.
These are typically deeds, legal docs etc. of low amount of photos.

I tested this with a typical acid-test.
High-speed scan a file to pdf, print it, compare to original.
It looks near-original.


Second-Best part.
We got the 12.000€ printer free of charge !
from the distributor, and pay about 2 cents/page in costs, full-colour printout costs.
We only pay for pages used, and nothing for the hw.

Total costs == 300€ /month, vs 500€ in the past by using an HP 3000 series network printer, full set of consumables, every month.
This includes all consumables, printer, service, support etc.
Yes, we paid nothing for the printer, and have a 3 or 4 year contract.

The scanner attachment is a special expensive add-on, was worth maybe 1500-3000€, and Very Good for us.
The single-pass top-bottom scan means no paper jams, ever, and amazing speed.

Iirc a Minolta top end model, re-badged something for the german market, official dealer and service, specialist printer retailer.

A curious, valuable, feature is you can manual-scan docs, while the printer is printing and sorting to == 10 hoppers at the same time.
Likewise, loading paper ink, staples etc. does not affect scanning at all.

So for == 15 people using it, scanning has zero impact on print workflow.
Volume doubled, time saved scanning == 77 hours / month, costs dropped 40%, filesizes dropped 90%, quality improved.

And we can print really neat presentations, stapled, with top-bottom covers on specialty gloss paper, for 10x less cost than print service, in maybe 12 minutes for 50 sets of 30 pages.
Seldom used, but sometimes very valuable.

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-hanermo (cnc designs)