[filmscanners] RE: 2 vuescan questions

["LAURIE SOLOMON" <laurie@advancenet.net>]

I need to amend my statement.  Upon rereading it as it appears on the list,
I realized that my comments about the white point being at 0 producing very
dark images was inaccurrate.  I was thinking of white point settings in
Photoshop not Vuescan.  In Vuescan, as a previous poster suggested, a 0
setting for the white point would result in blown out details (i.e., a clean
all white in the light areas above the clipping point).

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of LAURIE SOLOMON
Sent: Saturday, September 20, 2003 10:27 AM
To: laurie@advancenet.net
Subject: [filmscanners] RE: 2 vuescan questions


You should not be leaving the white point at 0; the default is 1.  Leaving
the white point at 0 will result in a very dark image indeed.  The Black
point's default is 0.

Time consuming or not; if you want good scans, you need to make required
adjustments of settings on a slide by slide basis before doing the final
scan unless you plan to merely scan and output the data via a raw lineal
TIFF file to some image editor where you will make the needed adjustments.

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Nagaraj, Ramesh
Sent: Friday, September 19, 2003 10:56 AM
To: laurie@advancenet.net
Subject: [filmscanners] RE: 2 vuescan questions


1) I do leave Black & White points at 0. Its really time consuming to set
those values for each slide, so I will leave at defaults.
   I too would like to know other experienced user's opinion on it.

2) Try using "Image" in "Input" tab

Thanks
Ramesh





-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of James Gaa
Sent: Friday, September 19, 2003 1:22 AM
To: Nagaraj, Ramesh
Subject: [filmscanners] 2 vuescan questions


I have two questions about using vuescan.

1. Some people in the recent discussion on 8 vs. 16 bits have mentioned the
histograms in vuescan. In my experience, the preview histogram is not very
useful for what I would have thought was a primary use: setting the
whitepoint and blackpoint. For example, if I adjust these points so that the
histogram stretches almost all the way across the graph, I find that the
scan image has black in it, as indicated by turning on the switches to show
black and white areas. In short, the preview histogram looks right, but the
scan doesn't; and I haven't found empirically a way of reliably fudging the
blackpoint adjustment. The default blackpoint is zero, I believe (I'm not at
the machine that has Vuescan); but using it seems to leave a lot of "space"
on the left, at least according to the histogram. This occurs on slides that
are properly exposed, both visually and according to the histogram (i.e., no
unintended areas of black or blown-out highlights. Am I doing something
wrong? Should I just go with the defaults?

2. I occasionally scan slides (using a Nikon IV-D) that have a good deal of
orange and colors close to it, expecially orangey rust. I haven't found a
way of setting the options in Vuescan to produce a scan that matches the
slide closely. The problem seems to exist only when there are large areas of
such color. Any suggestions?

Jim Gaa

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