Yeah, I can see why that would upset him. Designers spend years getting pages looking right, good thick use of true colour, arrange things perfectly so there's depth in the visual presentation. Page layout is an art. So is technical writing, although maybe it doesn't look that way.
So, he spends years getting it looking just perfect, then some rotten so and so uploads a 256 colour scan that looks OK on a screen, and terrible when printed out in the real world. I'm fine with people doing similar with stuff I wrote, but I don't own copyright on that, and it wasn't that accurate to begin with. Ralph is way off the other end of the scale on Amiga technology. No wonder he was upset. Still is, by the sound of it.
I do use scanned works, but I scan them from originals I am interested in. I do not distribute them. I don't even leave them around on machines with internet access so they cannot be hacked. This is legal, they really ARE for personal study. And they are never as easy to use as a printed work.
I can guarantee you, it won't be in pristine condition by the time I'm done with it. That might sound like sacrilege of a holy relic, but books are tools, as well as beautiful objects.