I've spent hours trying to remove vertical streaks and stripes from scanned images from my Canoscan 8800F Scanner. In an effort to save others my time, here's the problem and solution.
The problem image:
The solution image:
Canon email help was somewhat helpful, although they never solved the problem. To fix the vertical artifacts I had to lie to the scanner and tell it these were "Color Photos" instead of "Black and White Photos". Then everything worked fine. Must be some bug in the Black and White image processing algorithm.