Digital BW, The Print

A CCD counts photons and produces a voltage as a function of the number 
of photons detected over a time window (integration time). So while it 
is probably a misnomer to call anything associated with CCD's analogue, 
the effect is similar if it is done correctly.

I would much prefer an integration time based on the film and then gain 
adjustments of the output voltage prior to the analog to digital 
converters - with some care taken as not to increase the background 
noise level.

Truman

Austin Franklin wrote:

>Anthony,
>
>  
>
>>Some scanners allow you to adjust exposure time, analog gain, etc.,
>>    
>>
>
>The use of the term "analog gain" by some manufacturers is really erroneous.
>The adjustment called "analog gain" does not allow you to adjust the actual
>analog gain of the CCD/CCD front end.  It allows you to adjust the exposure
>time.
>
>Austin
>
>  
>



[Non-text portions of this message have been removed]