http://www.vision-color.com/impulz-training-tutorials/
Peter, it's really important when we make the capture, then information is reduced in a extraordinary way, we have an spectral signal that arraved at each photosite, having a power value for each 1nm bandwidth (to say a interval), that signal has a SPD (spectral power distribution for each photosite) but then information is reduced to 3 numbers R,G and B for a píxel, or to 3 densities in a color film. This is a big loss of information.
For this reason emulating velvia from a portra shot is not easy, and if you make a portrait with Velvia 50 it will be very dificult to make him look like a "person", with PS...
But once color has been reduced to a tri-stimulus reading, say portra, yes... the impact of one scanner or another it can be near exactly matched with a conversion LUT. This is well known, and Hollywod has a big industry working just in it. So scanner has no importance for color, the important thing is your set of color profiles.
I've really been reading a lot about colorimetry (because job), I could be speaking about it during weeks, including organic process of it, I use spectrometer every week... look what that people do http://www.vision-color.com/impulz-training-tutorials/ it's amazing.
Then there is "Perfectly Clear"
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