Need Help Printing Digitial Images of Text From a Book

Hi there! I am trying ot find out how to use a digital camera to take a
picture of text from a book, convert the image to black text on a white
background, and print it out.

So far, I can take pretty good photos of the pages, but the image always
has shades of gray in it, which makes it hard to read when I print it out.

Does anyone know a way to take an image and make it black and white with
no gray?

Thanks a lot,
Steve