I'm a little wary of saving things in mono as
somebody else
mentioned - I'm sure that could have a negative effect on the
OCR process at a later date. Greyscale (8 bit) I expect is
fine though.
I usually use greyscale with a good interpolator to increase my
dpi 2 to 3x linearly (increasing the dotcount 4 to 9x overall) and
Then cast it to 1 bit. Works great. Just going directly from
8 bit to 1 bit at the same dpi is a waste of good information.
John A.