While we seem to all agree that JPEG compression is not ideal, there ARE lossless options for TIFF and thus PDF formats.? While yes, storage and networking and processing and scanning time is all relatively cheap, when someone is paying all that on their own dime, there are decisions to be made.
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Where I come from, the rule for text-ish documents is 300 B&W and for image-ish it's 200 @256, and this for financial, governmental types.
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The one thing with image cleanup routines, they are mostly made for text based documents and are looking to clean up the text. As such, they don't have the "understanding" as to the particularities of schematics.? In the way back days, there was vectorizing tools to help engineering firms convert scanned drawings, those things on dead, ground up trees to CAD files. But they required both a lot of work to verify the exactitude of the resulting CAD file and possibly re-verify and re-authorize it.?
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The basic rule here is that you can clean up or otherwisely "alter" a document as long as the understanding does not change.
