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RE: filmscanners: Dust in Sprintscan 4000?
"If,
instead, the "dirt" is really chemical compounds or small partially dissolved
pieces of emulsion, then ICE probably wouldn't help as infrared light would pass
through it as easy as the film itself. If anyone with ICE notices this
type of "dirt," you might report to us if ICE is of any use. This is all
really quite irrelevant because no lab should embed any kind of dirt in the
emulsion. If you see it, tell you lab about it and insist that they do
something about it."
If the
impurity can be "seen" by infrared light (including embedded dust in the
emulsion, and defects in the film) then Digital ICE will identify the defect and
attempt removal, usually with success.
Jack
Phipps
Applied Science Fiction
In a message dated 9/19/2001 11:30:59 AM
Pacific Daylight Time, cdober@ev1.net writes:
Even with these
precautions I can see significant amounts of
dust when the scan is greatly
magnified. I've come to the conclusion
that almost all of it embedded in the
emulsion and results from sloppy
processing labs with no filtering of their
solutions. Some labs give
MUCH better results than others from the
cleanliness standpoint as well
other areas.
I've also noticed that there are two
types of dust. The first type is made up of rather large pieces and is
easy to brush off a slide or negative. The other type is much much
smaller and does indeed seem to be embedded in the emulsion and doesn't brush
off. The first type isn't a problem, is easy to remove, and doesn't
require ICE if you take care of your slides and negatives.
The
second type is very rare (for me) and I don't know if ICE would help remove it
or not (I don't use ICE). If it is indeed made of dirt particles because
of poor filtration by the lab, then ICE might help remove it. If,
instead, the "dirt" is really chemical compounds or small partially dissolved
pieces of emulsion, then ICE probably wouldn't help as infrared light would
pass through it as easy as the film itself. If anyone with ICE notices
this type of "dirt," you might report to us if ICE is of any use. This
is all really quite irrelevant because no lab should embed any kind of dirt in
the emulsion. If you see it, tell you lab about it and insist that they
do something about it. If not, find another lab. In the meantime,
I've never found a real need for ICE and have only had one "contaminated"
slide that required any tedious clone tool use to remove the zillions of
invisible (to the naked eye) "dirt" particles.
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