Re: [APML] Acer Sprint Scan

[hermperez@worldnet.att.net (Herm)]

I agree, but this is how Nikon specs their scanners...again, I would not buy a
scanner based on specs, God knows what method they use to make them up.

Herm

Chuck Vaughn <aa6g@aa6g.org>  wrote:

>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>
>
>--  APML Archives at <http://www.system.missouri.edu/apml/>  ---
>                Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://www.system.missouri.edu/apml/>  ---
                Unsubscribe at <majordomo@seds.org>