The Output tab of Vuescan has a setting for "TIFF file type" and the two reasonable choices are either 24-bits per pixel or 48-bits per pixel. I'm not sure which to use. I've scanned slides both ways and *think* that I see a small difference between the two setting when imported to LR2. The instructions for this setting are:
TIFF file type
This option describes the resolution of the cropped TIFF file, in bits per pixel. It should
normally be set to 24-bits per pixel, since many image editing programs are unable to
read TIFF files with higher bit depth than this.
I'm trying to figure out if LR2 is one of the "many imaging programs" that does not read 48-bit files. Since the 48-bit files are much larger than the 24-bit files I'd stick with the 24-bit setting if LR2 cannot read the 48-bit files. Looked in two different guidebooks but do not see the answer, although I'd bet its in there somewhere.
Thanks.