Hi Chris -
This basic is this: Images made to show on screen are usually in 72dpi, while for-print images are up around 300dpi. This is because without the higher dots per inch, graphic images will appear low-res when printed.
Do what I do. Scan everything at 300dpi, even images you know will end up on the web. This will give you large pictures that you can edit easily in photoshop, and then shrink down to a web-friendly size.
If you scan at 72 or 100, you get smaller images that are easier to manage, but you're out of luck if you need to magnify it for example.
Good luck!
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