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[filmscanners] Re: Increasing effective scanner DOF

>Yes this works, although I have used a slightly different take on
>the technique. I have used it to combine  different digital shots,
>focusing on two seperate planes and combining with photoshop.....AND
>used it to combine two diferent density exposures, again in
>photoshop.  An easier approach would be to copy on shot on to a
>seperate layer and erase the unwanted portions with either the
>paintbrush or airbrush tools. This allows a nice soft transition.


>After the recent postings about the limited DOF with the Nikon
>scanners, I remembered an
>interesting posting from Dean Shough last year:
>>  For someone with time, Photoshop savvy, and an important slide that suffers
>>  from the focus problem, I would like to recommend "A Multifocus Method for
>>  Controlling Depth of Field" at
>  >  http://www.sgi.com/grafica/depth/index.html
>>  The author, Paul Haeberli, takes two images of the same scene and performs
>>  some manipulations to create a single image that retains the sharpest
>>  portions of each individual image. When applied to scanners, the two images
>>  would be scans with the focus set to different places on the slide.  It
>>  should not be hard to create  Photoshop action that will combine the
>>  sharpest portion of two scans using this technique.
>Has anyone actually tried this yet?  After all, it's relatively
>common practice to
>produce and combine differently exposed scans to increase the
>effective dynamic range of
>the scanner so why not DOF?

Andy D'Angelo
D'Angelo Photography

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