On Sat, 4 May 2002 01:13:27 +1200 (robsuisted@naturespic.com) wrote:
> A few weeks later and I've just done a full res 16x scan and been
> appalled at the level the noise streaks across the scan (in the
> direction of scan travel).
>
> I'm fast coming to the conclusion (and concern) that indivdual
> elements in the CCD array (if that's what it is?) are
> deteriorating with time? Is this feasible? Has anyone else seen
> it?
Is this the exact same tranny, the exact same software with the same
settings? With/without Nikon colour manglement engaged?
I only ask because it's quite possible to reveal this sort of horrid mess
with practically any CCD scanner if you try too hard to extract all the
shadow information. Normally, a sensible black point just amputates it, but
messing with curves especially, to try and increase shadow separation, will
exaggerate all the non-linearities.
If you've upgraded Nikonscan, that may be a factor.
Vuescan (if you use that) generally pushes the envelope a bit and you get
more shadow detail at the cost of more exquisitely rendered grunge.
If you can get rid of the horribleness by clipping the black point a
little, without sacrificing much shadow detail, do so:)
Regards
Tony Sleep
- Online portfolio & exhibit; + film scanner info
& comparisons
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