NikonScan auto crop problem

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Forest

I'm having a problem with NikonScan 4 auto crop. (Coolscan LS50). When I
view the thumbnail, all negs are correctly cropped. But when I press
Preview or Scan, the resulting scan will include part of the next image.

Any way to get around this ?
 
Forest said:
I'm having a problem with NikonScan 4 auto crop.
Click to expand...

I'm not surprised, Nikonscan doesn't have an "autocrop" function. ;-)
(Coolscan LS50). When I view the thumbnail, all negs are correctly
cropped. But when I press Preview or Scan, the resulting scan will
include part of the next image.

Any way to get around this ?
Click to expand...

The upgrade to 4.02 is supposed to have fixed this occasional problem.
If it is more consistent in your case it would be interesting to know if
the upgrade fixes it too.

Also, remember that the default preview or scan area for the Nikon is
actually wider than a full frame. The SA-21 frame width 5959 pixels at
4000ppi, which around 37.8mm, so you can get a little of the adjacent
frames if you don't drop the preview or scan. Also, the SA-21 crops a
little of the frame (around 0.5-0.7mm) so that black border at the top
and bottom of default previews and scans is actually the SA-21 edge
itself, not the edge of the image. As I mentioned recently on a
different thread though, the crop is actually a lot less than a standard
slide mount makes, but worth investing in an FH-3 holder, which doesn't
crop, for the occasions when it is a nuisance.

If you do make a "full frame" crop, save it as a user setting so that it
will become the default crop next time you start the software.
 
Kennedy said:
The upgrade to 4.02 is supposed to have fixed this occasional problem.
If it is more consistent in your case it would be interesting to know if
the upgrade fixes it too.
Click to expand...

I've just installed Nikonscan 4.02 and the cropping feature of NikonScan
is much better.

but worth investing in an FH-3 holder, which doesn't
crop, for the occasions when it is a nuisance.
Click to expand...

My scanned image are actually sized at .923 inch (short side, and this
is consistent) with the SA-21 strip-film adapter when the black borders
are cropped off. So the Coolscan V is really giving out 3692dpi, not the
4000dpi that people are expecting from this scanner.

From experience, what size image (short side, at 4000dpi) are you
getting from the FH-3 film holder ?

Thanks
 
Forest said:
I've just installed Nikonscan 4.02 and the cropping feature of
NikonScan is much better.

but worth investing in an FH-3 holder, which doesn't

My scanned image are actually sized at .923 inch (short side, and this
is consistent) with the SA-21 strip-film adapter when the black borders
are cropped off. So the Coolscan V is really giving out 3692dpi, not
the 4000dpi that people are expecting from this scanner.
Click to expand...

How did you determined that? Did you physically measure the aperture?
It sounds, from the comment on consistency, that you are basing that on
the pixel dimensions of the cropped image and an assumed ppi. Without a
physical measurement it is impossible to determine what the actual ppi
is. Remember that the SA-21 is *specified* as having a 23.3mm sized
aperture with a scanned image of 3654pixels on the short side. Obviously
there are tolerances on these figures and the true ppi, but Nikon do not
publish these.

Your measurement of 0.923inch corresponds to a 23.442mm short side, but
without an actual physical measurement of that aperture to compare this
with, you cannot actually conclude that the ppi is in error. My bet is
that the physical aperture is slightly larger than the specification -
measurement of my SA-21 confirms this, rather than the ppi to be the
source of the discrepancy.
From experience, what size image (short side, at 4000dpi) are you
getting from the FH-3 film holder ?
Click to expand...
My FH-3 has a physical aperture of 24.3 x 36.0mm with a +/- 0.1mm
accuracy of the crude callipers I used to measure it.
The resulting scan is 3833x5660 pixels, which equates to
24.33955 x 35.941mm assuming 4000ppi
or 4006.5 +/- 16ppi on the short side and 3993.4 +/- 11ppi on the long
side. So 4000ppi is well within the measurement accuracy of the
physical aperture.
 
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