[filmscanners] Re: [filmscanners_Digest] filmscanners Digest for Mon 19 Aug,2002

["Jonathan Ratzlaff" <jonathanr@clrtech.com>]

At 12:00 AM 02/08/19 +0100, you wrote:
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I had a photosmart scanner that exhibited this effect.  There is a bit of a
same problem with my scan speed scanner however it is not as pronounced.
It seems to be most prevalent when I would scan from a bright part of the
image into a dark part.  turning the slide around so that the dark part
would scan first seemed to improve the situation.  i assume it has
something to do with the ccd sensor being overloaded in the thin part of
the slidee and then taking some time to adjust.
If it occurs around the bright part, it may mean that the lens in the
scanner needs cleaning.  There may be an accumulation of scunge on it that
is causing the image to flare slightly.

the reason that you do not see this with negatives is that the density
range in the negative is so much less that even the thinnest part of the
negative does not overload the CCD and there is not enough difference
between the thinnest and densest part of the image to create a problem.

>Topic: "Halo" Effect
>===============
>Date: Sat, 17 Aug 2002 06:46:47 -0400
>From: "Robert DeCandido, PhD" <rdcny@earthlink.net>
>----------------------------------------
>Hello All,
>
>I have a Polaroid Sprintscan 4000 (not the Plus version) and am using
>Vuescan.  When I scan a slide (either Kodachrome or Provia/35mm), the
>white areas (such as a building illuminated by the sun; or pages of an
>open book) in the scan will exhibit a "halo" effect.  This appears as
>a kind of a whitish or even greenish glow surrounding the white object
>in the scan.
>
>My questions are: Is anyone else seeing this or getting this effect on
>their scans?  Is this something gone wrong with the scanner?  Is it
>something that different scan settings in Vuescan can correct?
>
>Using Knockout 2.0 I can correct most if not all of the "halo" or
>"after glow."  However, if someone can set me straight regarding how
>to solve the problem before the scan, I would be most appreciative.
>
>Thanks
>
>Robert DeCandido
>NYC
>
>
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