Response to Scanning negs with dense base

Hmmm, interesting!
Can you give us a bit more info Ryuji?
Are you doing the scans in full colour mode?
Are you scanning in B&W negative mode? (Never a good idea, IMHO, because it uses only one channel of the scanner, and leaves the software to automatically select a black and white point)
Have you tried a RAW mode scan to see if the shadow detail is captured by the scanner at all?

The only reason I can think of at the moment why this should happen, is that the greenish base of the film is acting as a strong filter to one or more of the scanner RGB channels.
Or, on second thoughts, it's just as likely that the black-point detection in the software is confused by the base density, and consequently is setting the black point too high.
I think a colour RAW scan, followed by inversion, level correction, and desaturation in Photoshop should sort the problem.

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