My two cents is I use a colour meter that reads density in greyscale, rgb and Lab... so when I scan I open up the image and with a 3pixel apeture setting I check the L values in the shadows and in the highlights to make sure that I am going to be able to record detail where I want. From that point on its a matter of curves in PS to set the image .... L reads in 0-100 density which is in some regards relevant to the 10 zones .
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