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Filmscanners mailing list archive (filmscanners@halftone.co.uk)

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[filmscanners] RE: Lines in scans



Scott,

Thanks for your input.

My scan lines are running across the frame, i.e. perpendicular to the
scan direction.  In addition, they are evenly spaced on the frame.  I
don't believe it's the scanner (hardware problem) as they only appear
when doing 16 bit scans. They are not present on 8 bit scans nor are
they present when scanning with VueScan.

One Polaroid tech thought it was because I have service pack 4 on my
Windows 2000 but another tech denied that and said it was because my
scanner is on top of my PC and the emr from my PC was interferring with
the scanner.  I moved the scanner but the lines continue.  Polaroid is
now elevating the issue.  What fun!!!

Tom

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk] On Behalf Of
scott@slrobertson.com
Sent: May 25, 2004 10:03 AM
To: TMaugham@yahoo.com
Subject: [filmscanners] RE: Lines in scans


Your scanline problem sounds like an issue with Polacolor and/or your
CPU and SCSI interface, but I'll relate a similar problem I had with my
scanner
anyway:

I had to send my SS4000 back to Polaroid right after I bought it a few
years ago to fix a scanline problem. I was seeing single pixel dark
scanlines in the scan direction. There were 8 or ten, always in the same
location and distributed randomly across the image and across color
channels. Polaroid replaced the CCD.

Lately I've been seeing these again and suspecting dust on the CCD, I
disassembled my scanner, unbolted the daughter card on which the CCD is
mounted and cleaned the cover glass with Pec-12 solution (pure alcohol).
Since the front surface mirror was exposed, I also carefully cleaned it
by blowing as much dust off of it as I could. A really dusty mirror will
lower your image contrast. I don't really recommend anyone try this
unless you an afford to trash your scanner :-). Anyway, this got rid of
many, but not all, of the scanlines. It could be that some of the CCD
cells are failing or dust somehow got under the cover glass, I suppose.

Scott Robertson
--
Scott L. Robertson Photography
Travel, Editorial, Assignments & Prints
www.slrobertson.com



> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk] On Behalf Of Tony Sleep
> Sent: Tuesday, May 25, 2004 3:34 AM
> To: scott@slrobertson.com
> Subject: [filmscanners] Re: Lines in scans
>
> Thomas Maugham wrote:
>
> >
> > Using a Polaroid SS4000 on a PC with Win 2000 Pro,
> Polacolor 5.0, and
> > Silverfast Ai 5.0, I am getting horizontal lines appearing
> on my scans.
> > There are about 12 lines evenly spaced.  Interestingly, when I use
> > VueScan the scans are fine.  Can anyone PLEASE shed some
> light on this?
>
> Could be some other process stealing CPU cycles. It's ages since I've
> used Polacolor (VS works better for me), but did have the problem at
> one time though I can't now remember what the culprit was.
>
> Regards
>
> Tony Sleep - http://www.halftone.co.uk
> --------------------------------------------------------------
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