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[filmscanners] Re: Film base color settings in VueScan

For slides there is no real need to lock film base color.  In fact, Ed
Hamrick suggests the "image" setting for scanning slides.


----- Original Message -----
From: "Vincent Cleij" <vcleij@planet.nl>
To: <mlidaka@Ameritech.Net>
Sent: Monday, September 30, 2002 1:57 PM
Subject: [filmscanners] Film base color settings in VueScan


I am using VueScan 7.5.47 with a Nikon LS30 and have some problems scanning
slides. When I display my slides with a projector on the wall they look
pretty good but with VueScan and also with SilverFast (4.2.7r07) I can't get
results that comes close to what I see on the wall. With some slides I found
that I could get good results when I first scan a slide that does not have
problems, then lock the film base color and image color and then scan the
slide that gives problems. This workflow gives good results with slides that
does not contain dark or black parts (e.g. a photo from the sky with only
clouds and blue parts). But with slides that do not have light parts it does
not give good results (e.g. with photos of trees taken from an air-balloon
without light parts).
My question is what is the purpose of the film base color settings when
scanning slides? When scanning negative film it is used to remove the orange
color mask.
When I check the Lock film base color option I can read the settings VueScan
calculated after the last preview. The values are e.g.: Red =  0.493, Green
= 0.443 and Blue = 0.692. Are these values strange for a slide? When I open
the 16 bits raw scan file with PhotoShop (6.0) I get a very dark image.


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