Alfred Hitchcock

Once the screenplay is finished, I'd just as soon not make the film at all ... I have a strongly visual mind. I visualise a picture right down to the final cuts. I write all this out in the greatest detail in the script, and then I don't look at the script while I'm shooting. I know it off by heart, just as an orchestra conductor needs not look at the score ... When you finish the script, the film is perfect. But in shooting it you lose perhaps 40 percent of your original conception.
-- Alfred Hitchcock