Re: [APML] Acer Sprint Scan

[Chuck Vaughn <aa6g@aa6g.org>]

Herm wrote:
> 
> Acer Scanwit, it can generate 12 bit output and this is often how dynamic range
> is specked:
> 
> DMax of 3.6 is 12 bits or (log10(2^12) = 3.6
> 
> The box claims a Dmax of 3.2
> 
> I would not trust the specs in any of these things, who knows how they measure
> it..

Dynamic range and number of bits have absolutely nothing to do with each other.
Any number of bits can represent any dynamic range. More bits simply means 
smaller steps for any given dynamic range. The reason you generally see more bits
associated with a larger dynamic range is to keep the step size small and 
minimize the possibility of posterization if the image is greatly stretched.

Chuck <aa6g@aa6g.org>

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