I wasn't clear in my prior post. The lines are there in Polacolor 8 and
16 bit scans and in Silverfast 16 bit scans. They are not there at all
in any VueScan scans nor in Silverfast 8 bit scans. Your throughput
theory is interesting but the fact that VueScan 16 bit scans are fine
seems to eliminate that.
I sent some info to Polaroid last night and am now waiting to hear from
their tech people...
Thanks for your help!
Tom
-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk] On Behalf Of
scott@slrobertson.com
Sent: May 26, 2004 10:09 AM
To: TMaugham@yahoo.com
Subject: [filmscanners] RE: Lines in scans
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 -
> > --------------------------------------------------------------
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> >
> >
>
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