Grayscale scanning comes into Acrobat as black and white

I am trying to scan photos and other documents that have grays in them, using Acrobat Pro 9.
They are coming in as if I had specified black and white.
What am I missing?
Thanks in advance.
PS Sorry about the wierd screen name. I had tried a number of nice ones, including my old Adobe user name, but they were all rejected.

Following up to see if anyone has some solid ideas on how this might be happening.
Thanks!

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