Automated method for downsizing PDF files?

i have run into the limit of a 1 TB disk and need to return to an old problem where I have a lot of scanned documents that i printed to PDF using Preview and which are now taking up a ton of space. Some of the are 100 GB for roughly 10 or 20 page documents.
can anyone help me with a workflow that would enable me to select all PDF over - say - 5 GB in size and to downsample them?
i have a set of filters that will do this by selecting one by one and i do have Adobe Acrobat Pro (i now have it) - and my recollection was that there was a set of AUTOMATOR scripts that let me drag PDF files over a folder to downsample them? does anyone remember what this was and or have advice? i'm an Automator newbie so the first one of two runs at this were not easiest enough for me to implement at the time I first started researching it...
TIA

hotwheels 22 wrote:
can anyone help me with a workflow that would enable me to select all PDF over - say - 5 GB in size and to downsample them?
If you have Acrobat Pro, you should use it. You don't need Automator.
There are several options. Fastest is Document > Reduce File Size, which works on batches of files.
Finer control can be achieved with Advanced > PDF Optimizer. Experiment with different settings on a typical file; when you've got what you want, build a batch sequence in Advanced > Document Processing > Batch Processing, then run it on the select files. (Details in "Processing in Batches" in Acrobat's Help.)
To find the files you want to work on, use, of course, Spotlight, with suitable Kind and Size search criteria.
(There are various options to reduce PDF file sizes, including something like PDF Shrink, or Automator actions involving Quartz filters, which can be customised with the ColorSync Utility. But none are as good as Acrobat Pro, so, if you spent the big bucks buying it, you might as well get your money's worth.)

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