First take it into photoshop and go to the tool bar, click on image --- mode ---grayscale. Then adjust the contrast to make it pretty high, you might have to play with this awhile to get the desired effect. Then go to image ---adjust ---threshold, and it'll turn everything into hard black and white, you can move the slider until you get the look you want.
Then finally you'll need a program that can convert bitmaps to vector. You can use Illustrator CS2, or I use the built in tracing program in Corel X3 which is the best I've seen so far.
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