Re: Scanning for Stitching with Vuescan

Sandy, I feel your pain. I'm about half way through a project of scanning
260 5x7 glass plates on my 2450 and I'm having the same problem. I have had
some success by setting clipping to 0, the color adjustment is set to none,
the white point to 0 and the leaving remaining sliders on the color
adjustment screen set at 1.

I asked Ed about this and here's his response:

You also need to lock the film base color. It's varying with
each scan, which causes the problem you're seeing.

This is described in more detail in the VueScan User's Guide,
in the "Advanced Workflow Suggestions" section.

Regards,
Ed Hamrick

----- Original Message -----
From: "Eric Neilsen" <e.neilsen@worldnet.att.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Saturday, February 21, 2004 9:38 AM
Subject: RE: Scanning for Stitching with Vuescan

> Sandy, Not being a Vue Scan person and using my Epson 3200 - Is it
possible
> that your scanner is giving too different exposure based on the heat of
the
> lamp? The Epson warms up before scanning and before you calibrate it if
> needs to be fully warmed up. Can you reverse the order of scanning or do
an
> additional scan of your first 1/2 of the negative?
>
> Eric Neilsen Photography
> 4101 Commerce Street
> Suite 9
> Dallas, TX 75226
> http://e.neilsen.home.att.net
> http://ericneilsenphotography.com
>
>
> > -----Original Message-----
> > From: Sandy King [mailto:sanking@clemson.edu]
> > Sent: Saturday, February 21, 2004 9:56 AM
> > To: alt-photo-process-l@sask.usask.ca
> > Subject: Scanning for Stitching with Vuescan
> >
> > I am using the Vuescan software to scan 12X20 images with my Epson
> > 836XL 12X17 scanner. This has to be done in two passes and I stitch
> > the files together in Photoshop.
> >
> > I am having a problem. After the first scan I lock the exposure down
> > so that in theory there should be no difference in density between
> > the first and second scans. In practice, however, there is enough
> > difference in density between the two scans so that when they are
> > stitched together one side is visibly lighter than the other.
> >
> > Since there are a few Vuescan users on this list I am hoping that
> > someone with more experience with the software than me can explain
> > what I need to do to get equal exposure on both scans.
> >
> > Sandy King
Received on Sat Feb 21 12:11:35 2004