I got to throw in my long-winded two cents worth. I have scanned hundreds and possibly thousands of pages.
If you are scanning from a book and want an excellent scan, you must get it flat on the scanner. In some cases, this will mean damaging the binding. If I am scanning the entire book, I don't care if I break the binding. Cutting the binding off makes it easier.
Once the book is scanned, I will be happy with the scans. I no longer care about the book. You can scan entire books by cutting off the binding and hand-feeding them. It is a slow, tedious task. Nowadays, I pay someone to scan books for me. I highly recommend "Book Scan US" for this. They have scanned 47 books so far for me. How much it costs is complicated. You need to ship the books to them, which is a cost. After that, the basic cost is $1 to scan a book of 300 pages or less. If you want the book back that costs return shipping, there are options (OCR, Higher resolutions, etc.) and small fees for some things. For example, I had some odd-sized books that needed to be cut down to fit their scanners. You also need a dropbox account and a Google account. You order by filling out a Google sheet spreadsheet. You get your books via a shared folder on DropBox. It takes them a long time to get the scanning done. I think it is one person. You only pay once the work is completed. "Book Scan US" is highly recommended. I'm working on box number three. I load all my scanned books into Calibre, where I can tag them, add the contents, and index them to the comments. It is all searchable.
Scroll Saw Wood Working and Crafts believe their method is a copy protection scheme. They are wrong. I have the digital versions of the magazines from their CDs, and I don't have any severe problem getting patterns from those. I have to put some back together because they were scanned as separate pages. If I were to scan the paper, I would cut the patterns out, cutting them in half to get them to fit on the scanner if needed.
The first thing I do when I cut a scanned pattern is open it in Gimp and clean it up if needed. If the pattern is in more than one piece, I can put it together in Gimp. Next, I copy the pattern to Inkscape and trace it converting it to SVG format. There are some tweaks you can do in Inkscape, like setting the line width and color, but the big thing is that once I have the pattern in SVG format, I can make it any size I want with zero degradation. When I triple the size, I don't get broad gray pixelated lines, and the lines stay the same when I shrink a pattern. The sizing works great. If I want a pattern 4 inches high, I lock the dimensions and set the height to four inches. When I print the pattern, I get a four-inch pattern. I can set the page size to the dimensions of the piece of wood I am working with, add the patterns I want to use, resize and turn them any way I need to make maximum use of the wood. Set the page size back to normal and print. It is a steep learning curve, but it is worth the effort.