Ken--
The theory is that noise is random, so if you compare two or more
"identical" scans, any differences must be due to random noise and
not be part of the image on the film. So when multiscanning, the
scanner software compares the multiple images and eliminates any
variations (I think) by averaging the images together. The only
place you'll see this noise is in the deep shadows of positives, or
the highlights of negatives.
--Bill
At 9:08 PM -0800 5-11-01, Ken Durling wrote:
>Someone feel like expounding briefly on the multiple pass technique?
>I'm using Vuescan and a FS2710, slides and both color and B&W negs.
>What is the purpose and what determines the number of passes you set?
>I tried a couple at 2 passes, and saw no noticeable effect, although
>I'm not at all sure what I'm looking for.
>
>
>Ken Durling
>
>
>
>Photo.net portfolio:
>
>
--
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Bill Fernandez * User Interface Architect * Bill Fernandez Design
(505) 346-3080 * bill_sub@billfernandez.com *
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