Okay . . . I'm starting to pick up on this, thanks!
I didn't realize that a sharp white/black contrast could be tiring to the eyes, as Caleb666 and mr ploppy have said. Also, pdurrant points out that printed book often use cream paper.
This is my first and only e-reader.
I am learning to adjust to it (in the physical sense of screen size and light weight), but I can't honestly say that I found printed books to be tiring to my eyes, and they
were "whiter" and "brighter" looking . . . . maybe I just didn't notice it to be tiring.
So it seems that many of you are saying that the "grayish" background is actually better in the long run!
JMikeD: you may be quite right. I read under somewhat dim conditions indoors (haven't tried reading outside yet); didn't notice a problem with regular books, but will try brighter lighting with my Kindle, then.
I did note that in reviews of "Nook vs. Kindle", it was frequently pointed out that brightly lit LCD screens would be much more tiring to the eyes than the "E-ink" on our Kindles.
OK! Good! . . . I'm still learning, and am glad to be here!
Thanks very much everyone,
Joe