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Colouring has almost always been done at the same size as the printed page. In the case of computer separation, where file size is an issue, it's a necessity.
Every scanner driver has a scale control built in, so it would seem obvious to reduce the size of the page when you scan it. But I'd recommend caution.
As I said in the section on bitmap graphics, their big drawback is that enlarging them tends to degrade the image, because you can't enlarge the image without enlarging the grid of pixels which makes it up. This means that if you scan the picture even a tiny bit too small, there's no way of correcting the mistake - you just have to scan again.
This is why I recommend scanning the artwork at same size and scaling down in Photoshop afterwards. Even if you make a mistake in Photoshop, at least you don't have to go through the palaver of scanning the artwork all over again (as long as you've kept backups!).
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