I've been scanning 4X5 negs the last few days
with my Epson 2450 and I'm getting a weird
pattern on my scans that looks kinda like a fingerprint
but it's definately not. I've tried scanning in
the holder and flat on the glass with same results.
Also tried 1800 as well as 2400 ppi, same prob.
The
On Mon, 24 Feb 2003 21:27:56 -0500, J. C. O'Connell wrote:
http://jcoconnell.com/temp/apartment02p.jpg
Newton rings. But I don't know how to get rid of them. Try a Google
search on Newton Rings.
TTYL, DougF KG4LMZ
- Original Message -
From: J. C. O'Connell
Subject: Weird scanning problem
Sample scan, cropped showing problem:
http://jcoconnell.com/temp/apartment02p.jpg
Thats a Newton ring, like Doug sez. Try raising the humidity in your
computer area.
William Robb
On Monday, February 24, 2003, at 08:27 PM, J. C. O'Connell wrote:
I've been scanning 4X5 negs the last few days
with my Epson 2450 and I'm getting a weird
pattern on my scans that looks kinda like a fingerprint
but it's definately not. I've tried scanning in
the holder and flat on the glass with
PROTECTED]
Subject: Re: Weird scanning problem
On Mon, 24 Feb 2003 21:27:56 -0500, J. C. O'Connell wrote:
http://jcoconnell.com/temp/apartment02p.jpg
Newton rings. But I don't know how to get rid of them. Try a Google
search on Newton Rings.
TTYL, DougF KG4LMZ
Yup. Sounds like newton rings. Try scanning the neges emulsion side down.
Works sometimes.
John Poirier
- Original Message -
From: J. C. O'Connell [EMAIL PROTECTED]
To: Pentax Discuss Mailing List [EMAIL PROTECTED]
Sent: February 24, 2003 7:27 PM
Subject: Weird scanning problem
I've
J.C.
Looks to me like ripples in a pond . . . is it possible that there is
something causing the film to stick out? Amybe some sort of particle
that isn't being scanned?
Otherwise, I'd say that the imaging sensor isn't being held steady,
or something, though that doesn't sound right
On 25 Feb 2003 at 14:50, Rob Studdert wrote:
True, as the emulsion side is irregular and will randomize the surface to
surface contact such that the sub-lamda interference patterns are no
longer
visible.
DOH, should read lambda of course.
Rob Studdert
Excellent explanation of
J. C. O'Connell wrote:
newton rings only occur when you sandwich
two pieces of glass right? Well in this case
there is only 1 piece of glass, the scanner's
bed glass. I am confused.
http://www.kodak.com/US/en/motion/support/faq/rings.shtml
Concentric bands of light sometimes seen
On Mon, 24 Feb 2003 21:36:23 -0600, William Robb wrote:
newton rings only occur when you sandwich
two pieces of glass right? Well in this case
there is only 1 piece of glass, the scanner's
bed glass. I am confused.
Newton rings can occur whenever two surfaces come in close proximity.
[EMAIL PROTECTED]
To: Pentax Discuss Mailing List [EMAIL PROTECTED]
Sent: Tuesday, February 25, 2003 12:27 PM
Subject: Weird scanning problem
I've been scanning 4X5 negs the last few days
with my Epson 2450 and I'm getting a weird
pattern on my scans that looks kinda like a fingerprint
but it's
It's an optical effect that comes from the proximity of the glass
surface and the negative, and damn it I can't remember what it's
called. (Newtonian Rings)? There is nothing wrong with your
scanner. It just wasn't really designed for the type of scanning
you're doing. (Scanning transparencies
I noticed the problem was always in the center of the neg and
based on what everyone said I figured the neg was too close to
the glass in the middle, hence sagging.
What I tried was placing 4 quarters under the corners of the
film holder to hold the neg slightly higher during scanning.
PROBLEM
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