For example,
scanners can only acquire the dynamic range of contrasty chromes when the
acquisition bit depth is better than 10-12bits. The context with scanners
is that the sensor is linear, leastwise not under software control, and
8bits can overlay only a part of the dynamic range.
Nope, Thomas was correct. High bit depth scanners (or cameras) often do capture a higher dynamic range but its not *because* of the increased bit depth. High bit depth often comes with other higher quality components that yield better dynamic range and that may be the source of this common misconception. The dynamic range is not confined by bit depth at all. Bit depth only defines the precision of measurements between black and white. It has nothing to do with determining how dark the darkest object is that is represented by the lowest number on the scale or how light the lightest object is that is represented by the highest number on the scale. Bit depth only determines how many steps there are between minimum and maximum.
Bob Smith
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