Opening 24-bit .tif files

How do you open a 24-bit or 48-bit .tif file in anything other than the defalt 8-bit format? (in CS3, CS4 or CS5 I have tryed in each)
I have a scanner that generates 24 or 48 -bit .tif files and I am unable to open them in anything other than 8-bit. I have tryed both Mac and Windows format.
What am I missing?
Thanks,

If your file is truly anything more than 8 bits per channel (24 bit), then it will open as a 16 bit per channel file in Photoshop. If your scans are opening as 8 bits per channel, then either you're not choosing the right options in your scanning software or that software isn't really doing what it claims to be doing.
What scanner and software? Can you post a file that you think is supposed to be 16 bit per channel and see if other people have the same problem with your file?

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