need the use of a scanner with sheet feeder (near Seattle)

Looking at it another way, DjVu condenses any image fed into it into a mathemetical expression that, when evaluated, yields as its result, the image of the original document. So, it's nothing like OCR. If the original image were a page full of little apples, the program will decide which apple is the best one, and when it reconstitutes the original image, will put as many copies of the one apple on the page as the original had. If there are subtle differences between the apples that the eye won't readily see, then the reconstituted image won't have those subtle differences. It goes beyond this too; it separates the text and calls that foreground, and everything that's not text is background. The background is compressed with a different family of wavelets than is used for the foreground.