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RE: filmscanners: GEM, ROC compared to Vuescan

John Matturri writes ...

> Related: why in general does Ice-based dust removal
> soften the image.
> The purpose of the IR channel is to identify the particular
> spots that are dust / scratches. Shouldn't
> the software only affect those areas
> leaving the rest of the image alone and sharp?

        The IR channel is not strictly speaking a picture of dust/defects ...
it also contains a component if the image itself.  The ASF trademarked
ICE algoritm apparently has a problem with this weakness of the IR
channel (comments?, Jack) ... whereas Ed's Vuescan algoritm does not.

shAf  :o)


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