The fact that they only appear when doing 16-bit scans using the Polaroid
software makes me think that it is not an EMR issue but a data throughput
problem. It would seems that twice as much data is being transferred over
the SCSI connection during 16-bit scans and the problem could be that a
buffer is overflowing periodically causing garbage or dropouts to be written
to the image file. I've never really used Polaroid's software, only Vuescan
and occasionally Silverfast, and I've never seen this particular problem
myself. At least you can use Vuescan as a fallback while Polaroid's tech
support works this one out.
Scott
> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk] On Behalf Of Thomas Maugham
> Sent: Tuesday, May 25, 2004 10:24 PM
> To: scott@slrobertson.com
> Subject: [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 -
> > --------------------------------------------------------------
> > --------------------------
> > Unsubscribe by mail to listserver@halftone.co.uk, with 'unsubscribe
> > filmscanners' or 'unsubscribe filmscanners_digest' (as
> appropriate) in
>
> > the message title or body
> >
> >
>
> --------------------------------------------------------------
> ----------
> ----------------
> Unsubscribe by mail to listserver@halftone.co.uk, with
> 'unsubscribe filmscanners' or 'unsubscribe
> filmscanners_digest' (as appropriate) in the message title or body
>
> --------------------------------------------------------------
> --------------------------
> Unsubscribe by mail to listserver@halftone.co.uk, with
> 'unsubscribe filmscanners'
> or 'unsubscribe filmscanners_digest' (as appropriate) in the
> message title or body
>
>
----------------------------------------------------------------------------------------
Unsubscribe by mail to listserver@halftone.co.uk, with 'unsubscribe
filmscanners'
or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or
body
