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[filmscanners] Re: Lack of contrast in the (raw) scans from VueScan ?

  • To: lexa@www.lexa.ru
  • Subject: [filmscanners] Re: Lack of contrast in the (raw) scans from VueScan ?
  • From: "Sassan Hazeghi" <sassan@cup.hp.com>
  • Date: Tue, 30 Apr 2002 01:04:00 -0700 (PDT)
  • In-reply-to: <20020429001301.6D3BE230E@cuprel1.hp.com>
  • References: <20020429001301.6D3BE230E@cuprel1.hp.com>
  • Unsubscribe: mailto:listserver@halftone.co.uk

 > From: Bob Shomler <bob@shomler.com>
 > ----------------------------------------
 > Vuescan is, as you have written, designed to get all that the scanner can get 
 >from film.  Default black and white point settings extend far wider than you 
 >might want in a final image.  Changing Vuescan's color white and black point 
 >percents can help here.  However having Vuescan save 48-bit mode tiff and 
 >making these adjustments in Photoshop 16-bit mode is preferred by many.  (This 
 >is what I do with my LS-30 scans.)

I am saving B&W images as 16bit tiff gray scale.  Should these be
saved as 48bit ?

 > If you're using 7.5 (beta or no point release) you need to get a newer 
 >release.  Some significant "dull image" problems were fixed in 7.5.2.  If 
 >you're at 7.5.11 or later you're probably OK, otherwise download the latest 

Thanks much for the hint; 7.5.14 seems to do much better !

 > Set Device->Option Types to advanced to see many of the controls, such as for 
 >exposure (which will be found in the device tab).
 > Also check out the Advanced Workflow Suggestions in the Vuescan help file.

Is there also a manual exposure control (similar to Analog Gain under
NS ?)  What is the auto-exposure algorithm being used and, other than
the whitepoint/blackpoint selection which essentially clips/stretches
the tonal range, how does one adjust ("center") the exposure to match
the mid point of the density distribution of the film durin the scan ?


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