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What many probably don't understand it that scanner's can create a scan in many formats. When they do that they can take a snapshot of the image in a totally graphic form such as bitmaps, tifs and similar digital images of pixel interpretations.

But scanners can also be used by a particular program for a digital file size that is much more manageable.

If you open standard adobe acrobat or any of the higher grade forms of Adobe Acrobat above the free “reader” you have choices of how to create a pdf. One of those choices is with a scanner to “read” or “scan” the document. As you point out it automatically can deploy “OCR” (optical character recognition) to turn some of the intense graphic information into more compactly rendered digital information.

If posters have Adobe Standard they can open the create a pdf from a scanner and follow along. Under that choice, they can open a screen called “Configure Presets” where options such as “Make Searchable (Run OCR)” are configured in the standard addition to be automatically selected unless you turn it off.

Secondly, they can then open the Optimization Options sub-menu and then they see the options automatically selected:

Deskew: Automatic
Background Removal: Low (But still turned on for OCR changes, guys)
Edge Shadow Removal: Cautious (But still turned on gang)
Despeckle: Low (But still turned on)
Descreen: Automatic (on by default but who knows what this alters)
Halo Removal: On (We already knew the Marxist didn't have a Halo so this matters only a little)

What you have pointed out and even a neophyte like me can see by opening the program is that there is a reason why an Adobe Acrobat program can turn a 2mb scan into a 350kb pdf and that reason is that it automatically manipulates the image. In summary, if a person wants to make a reasonable size electronic version of a document and starts by opening Adobe Acrobat Standard, the default settings for the program produce the missing background looking like white-out, it produces the OCR where the program picks and chooses based upon recognition all or part of words to render as Test and other portions to render as pixels, and lastly probably does a lot a things that aren't inconsistent with leaving layers as observable from someone else opening the document.

This is especially true if we want to find an observed forgery. When we are surrounded by nails, every tool begins to look like a hammer.