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External
Since: Jan 08, 2006
Posts: 1
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(Msg. 1) Posted: Sun Jan 08, 2006 6:28 pm
Post subject: Methods for scanning large format negatives
Archived from groups: rec>photo>digital, others (more info?)
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I just missed out on a chance to buy a great large fornat scanner on
eBay so now I'm back to square one...What to do?
I have a Mustek 1200 Flatbed Scanner which, I'm told should give me
good scans. But as for a negative adapter setup I wonder if a light
panel will give me a adequete light source? I think that the light
panels original purpose is for viewing negatives prior to printing and
so I assume they are the best alternative to a negative dedicated
scanner. Please verify or refute this. Also, is it nessessary to spend
a lot for a light panel? What is the amount of light 'rating' that I
need?
In this propossed setup, scanner with light panel mounted on it, is it
nessessary to disable the light inside the scanner used for standard
scanning?
Any other suggestions are welcome. |
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External
Since: Nov 23, 2005
Posts: 1029
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(Msg. 2) Posted: Mon Jan 09, 2006 12:57 am
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Feb 01, 2006
Posts: 525
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(Msg. 3) Posted: Mon Jan 09, 2006 5:57 am
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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If you are scanning large format images you need a scanner that can get
the detail that the images have. Musteks are very low end scanners, if
it doesn't have a transparency scanner, you can try to reinvent the
wheel but your best bet is to buy a scanner with a transparency
adapter. Epson, Microtek and UMax all make good scanners. If you are
buying new there are several around $500 that are excellent that can
handle images up to 8x10. If you only need 4x5 you can get buy with the
next model down in product range. But get a transparency adapter.
Tom >> Stay informed about: Methods for scanning large format negatives |
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External
Since: Aug 22, 2005
Posts: 292
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(Msg. 4) Posted: Tue Jan 10, 2006 8:12 pm
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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[A complimentary Cc of this posting was sent to
David J. Littleboy
<davidjl.TakeThisOut@gol.com>], who wrote in article <dptu56$7bh$1@nnrp.gol.com>:
> (Translation: Thanks for the MTF chart for the Epson: that's exactly what I
> needed to see.)
Actually, it is not MTF, but "edge response". I could not find a
formal definition of "edge response at given ppi"... What is it?
The maximal difference of neighboring pixels? Relative or absolute
(w.r.t. white)?
Thanks,
Ilya >> Stay informed about: Methods for scanning large format negatives |
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External
Since: Jan 11, 2006
Posts: 1
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(Msg. 5) Posted: Wed Jan 11, 2006 1:15 pm
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Oct 04, 2005
Posts: 833
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(Msg. 6) Posted: Wed Jan 11, 2006 7:57 pm
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Jan B. wrote:
> Roger,
> Thanks very much for posting your scan results. Can you tell me if you
> scanned the negs directly on the glass or in the 4X5 neg holder? The
> test you mention suggests that you scanned w/o holder, but maybe not.
> - Jan
>
With the holder. The best focus on my scanner is at
the film plane with the film in the holder.
Focus at the glass is slightly worse.
Roger >> Stay informed about: Methods for scanning large format negatives |
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External
Since: Oct 04, 2005
Posts: 833
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(Msg. 7) Posted: Wed Jan 11, 2006 8:01 pm
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Ilya Zakharevich wrote:
> [A complimentary Cc of this posting was sent to
> David J. Littleboy
> <davidjl.RemoveThis@gol.com>], who wrote in article <dptu56$7bh$1@nnrp.gol.com>:
>
>>(Translation: Thanks for the MTF chart for the Epson: that's exactly what I
>>needed to see.)
>
>
> Actually, it is not MTF, but "edge response". I could not find a
> formal definition of "edge response at given ppi"... What is it?
> The maximal difference of neighboring pixels? Relative or absolute
> (w.r.t. white)?
Yes, it is not MTF. Edge response is the maximum change versus
pixel spacing expressed as pixels per inch.
Roger >> Stay informed about: Methods for scanning large format negatives |
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External
Since: Aug 22, 2005
Posts: 292
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(Msg. 8) Posted: Thu Jan 12, 2006 6:32 am
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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[A complimentary Cc of this posting was sent to
Roger N. Clark (change username to rnclark)
<username RemoveThis @qwest.net>], who wrote in article <43C5C689.9020206 RemoveThis @qwest.net>:
> Yes, it is not MTF. Edge response is the maximum change versus
> pixel spacing expressed as pixels per inch.
I presume that the edge is slightly sloped, and "maximum" is counted
at the place where the edge happens to go along a boundary of the
"cells", right?
Thanks,
Ilya >> Stay informed about: Methods for scanning large format negatives |
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External
Since: Oct 04, 2005
Posts: 833
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(Msg. 9) Posted: Thu Jan 12, 2006 8:32 pm
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Ilya Zakharevich wrote:
> [A complimentary Cc of this posting was sent to
> Roger N. Clark (change username to rnclark)
> <username RemoveThis @qwest.net>], who wrote in article <43C5C689.9020206 RemoveThis @qwest.net>:
>
>
>>Yes, it is not MTF. Edge response is the maximum change versus
>>pixel spacing expressed as pixels per inch.
>
>
> I presume that the edge is slightly sloped, and "maximum" is counted
> at the place where the edge happens to go along a boundary of the
> "cells", right?
>
> Thanks,
> Ilya
Yes, but in the case of the Epson, the MTF is not that good,
so you really do not need the slope. The slope is used as
sightly offset sampling from row to two. This is very important
if the MTF is high at the sampling limit of the system as one
can't predict precisely enough where the actual edge is.
But when the MTF at the sampling limit drops below about
30%, the need for the sloped edge diminishes.
Roger >> Stay informed about: Methods for scanning large format negatives |
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External
Since: Aug 22, 2005
Posts: 292
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(Msg. 10) Posted: Fri Jan 13, 2006 3:41 am
Post subject: Re: Methods for scanning large format negatives [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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[A complimentary Cc of this posting was sent to
Roger N. Clark (change username to rnclark)
<username RemoveThis @qwest.net>], who wrote in article <43C71F33.4020204 RemoveThis @qwest.net>:
> Yes, but in the case of the Epson, the MTF is not that good,
> so you really do not need the slope. The slope is used as
> sightly offset sampling from row to two. This is very important
> if the MTF is high at the sampling limit of the system as one
> can't predict precisely enough where the actual edge is.
> But when the MTF at the sampling limit drops below about
> 30%, the need for the sloped edge diminishes.
Thanks.
Is there a simple way to recalculate this curve into the MTF curve?
I'm too lazy to do it myself if the prior art readily available...
I could not find even the definition on the net, not speaking of an
algorithm... Anyway, you probably have the data in a machine-readable
form too?
Thanks,
Ilya >> Stay informed about: Methods for scanning large format negatives |
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