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filmscanners: Tweaking images in PS6

I'm not very experienced in digital imaging and have a question which
probably has been discussed before.
I use an Nikon LS30 scanner to produce 48 bit tiffs with vuescan. Then I
tweak the images in PS6. Is it better to do all possible tweaking in 48 bit
mode, one after the other, which needs rendering the picture each time, or
is it better to convert the image to 8 bit and use adjustment layers which
renders the image just once.
Another question about vuescan: The LS30 internally uses 10 bit, the output
is just an 8 bit file. Vuescan produces images in 16 bit mode by rerendering
the file if I understood right. Has this file really more information than
the 8 bit file the scanner itself outputs?


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