Nur, I'm with you on gray scale. I have yet to find a book that yielded consistently better results using it or 400 dpi than I can get with a tweeked brightness setting and 300 dpi. I admit that small fonts should do better with 400 dpi, but I guess none of the books I've come across has a sufficiently small font to make using that higher resolution necessary. I've got this one horrible book printed in the Soviet Union that must have God awful print. Can't check it because my optacon died. I had hoped gray scale would do the trick for it, as its a classic, and I very much want to read it. But no joy. GS is as bad or worse than the various permutations of brightness and other things that I've tried. I know other people get great results with GS and the higher res. But for me, it just hasn't proven necessary or helpful as yet. Mary