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Re: [OM] Scanning/sampling

Subject: Re: [OM] Scanning/sampling
From: Jan Steinman <Jan@xxxxxxxxxxxxxx>
Date: Mon, 16 Mar 2009 17:13:41 -0700
> From: Wayne Harridge <jnlaruneevqtr@xxxxxxxxxxxxxxx>
>
> If I have a scanner which has a native resolution of 4800 ppi but I  
> then scan at 1200 ppi, how is that handled by the scanner ?  Does  
> the scanner just use 1 pixel of each 4 or does it average over the 4  
> pixels ?

You can bet that only the firmware developers know for sure. And  
they're all dead. :-)

My guess is that if it's a newer scanner, they scan at full res and  
down-sample in software. In the old days, there used to be a speed  
advantage to pixel-picking tricks, but I suspect no longer.

:::: "I feel frustrated that whenever I have a comment or criticism  
about your behavior, you immediately turn it back onto me." ::::
:::: "But what about you; you do the same thing!" ::::
:::: Jan Steinman, EcoReality <http://www.EcoReality.org> ::::




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