I ordered some of these calibration strips and I will come back with
some results. They suggested to me that with negative materials in
the practice there might be a problem with exaggerated contrast
while using profiles made from these calibration strips. In that
case they suggested to raise the contrast of the scanned target
manually, by preserving its color balance, and make a profile from
such target. This sounds a bit strange to me. I think we scan a
target and use a profile to avoid any tweaks. I can hardly wait to
make some hands on experiments.

Thomas