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[filmscanners] Re: Levels Adjustment-Scanner or Photoshop

  • To: lexa@lexa.ru
  • Subject: [filmscanners] Re: Levels Adjustment-Scanner or Photoshop
  • From: "" <al@greenspace.freeserve.co.uk>
  • Date: Sun, 19 May 2002 22:28:22 +0100
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  • In-reply-to: <3CE797BB.4020501@rcn.com>
  • Organization: greenspace.freeserve.co.uk
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>Is there any benefit of adjusting levels, curves, color etc in the scanner
>software prior to the final scan as opposed to later on in Photoshop?  Does
>adjusting it before the final scan avoid the "comblike" effect on the
>image/histogram that you would get from making the adjustment in Photoshop
>after the final scan. or does it make no difference when these adjustments
>are made?

Another factor is whether or not the scanner driver does make use of the 
highbit data
when making adjustments.  For instance, with the Minolta Scan Elite driver, if 
you output
to a 16 bit file but make significant adjustments in the driver software, the 
16 bit file has "combing".  Create an unadjusted 16 bit file and do the same 
in Photoshop and the histogram is completely smooth.

This is completely repeatable so it looks like the driver only uses 8 bit data 
to make
adjustments even when the final output is 16 bit!  I'm not sure how widespread 
this is in
scanner drivers but I don't think the Minolta software is an isolated case.

Al Bond

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