16 bit A/D in my Epson scanner allows for smooth gradations into shadow areas of the image file, after curves
adjustments. The "trouble areas" shown in this photograph were handled well by the 16 bit A/D conversion.
The 12 bit A/D of my old Nikon scanner has resulted in "sudden blacks" in the shadow areas. In particular
the hair of these children has turned to sudden black towards the top and sides of their head. After curves and
levels adjustments in Photoshop, the steps between each A/D sample have been stretched out too far in the black to midtone