[filmscanners] RE: Vuescan setting for "true neg?"

["Alessandro Pardi" <alessandro.pardi@inferentiadnm.com>]

Ken,

maybe this can help. My workflow is to open the raw scan in Photoshop, use
Channel mixer command to extract only the green channel (which is the
sharpest from my Canon FS4000, YMMV), convert to grayscale mode and invert
the resulting image.
If the histogram is fine (i.e. it doesn't show clipping at either end of the
scale), with this workflow you have all the information that the scanner was
able to read from the negative, and you're free to tweak it any way you like
it (first step would be to set BP and WP using levels).
The only thing you have to be aware of is the profile that Photoshop assigns
to the raw file: after a correct installation of my scanner software and
Vuescan, PS automatically prompts me indicating a Canon FS4000 profile as a
source, so all I have to do is confirm the conversion to my workspace of
choice.

alessandro pardi

> -----Original Message-----
> From: Ken Durling [mailto:kdurling@earthlink.net]
> Sent: giovedì 13 giugno 2002 07.28
> To: alessandro.pardi@inferentiadnm.com
> Subject: [filmscanners] Re: Vuescan setting for "true neg?"
> 
> 
> On Wed, 12 Jun 2002 20:47:21 -0230, you wrote:
> 
> >Ken writes ...
> >
> >> Working with B&W negatives, is there a combination of 
> settings of BP,
> >> WP and Brightness - and possibly other settings - that would
> >> theoretically give you an image that is "unaltered" of 
> your negative -
> >> similar to putting the neg in the enlarger?   ...
> >
> >  I would think you'd want to begin working with Vuescan's 
> 'raw' file ...
> >but a curious question is ... that is, because the raw data 
> will be in an
> >inapproprite gamma=1 space ... "would you want to invert 
> before applying an
> >appropriate gamma (to the positive), and then invert back?" 
> ... or ... "is
> >it the same thing to apply the same appropriate gamma to the negative
> >data???"
> >
> 
> 
> Thanks Michael.  I haven't used the "raw" file option before, I just
> save as TIFF files.  Exploring your suggestion, I see that when I
> instruct Vuescan to save a 'raw' file, it produces a default file name
> with a .tif suffix.  How is this different than the normal xxx.tif it
> saves?  
> 
> 
> Ken
> 
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