Okay... that was a wonderful explaination about 4-bit printer, but what about 24-bit scanning? What is the actual resoltion of the scanner and how can we scan at the settings that are claimed as possible in the service manuals? I have a 3015NI that the documentation says wills can at "upto 1200x1200 dpi" but a xerox WIA driver that will only allow 600dpi. I don't see any downloads for TWAIN drivers for windows 10 to get up to 1200 or 4800 or whatever, and haven't found any way to enable "driver conversion" in the WIA driver yet either.
Any additional insight is greatly appreciated.