Using a Nikon LS 3 with both NikonScan 3.1, and the latest version of
Vuescan I find a wide variation in skin tones under different light sources
see the images at:
The film used for both images is Kodak Portra 160 NC. Image 1 is with studio
lighting, Image 2 is with fill flash.
For printing the outdoor shot I used the Nikonscan image with Autolevels
from PS. The Vuescan image looked dead
For the Studio shot I used the Vuescan image with autolevels. The Nikonscan
image is far too yellow
note how the NikonScan is very warm compared to the cold Vuescan image.