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[OM] Re: which slide film? - scanner flare

Subject: [OM] Re: which slide film? - scanner flare
From: Wayne S <om4t@xxxxxxxx>
Date: Wed, 15 Sep 2004 10:22:21 -0400
Sorry for the misinterpretation on sharpening. I was up too late,
blurry eyed and hadn't read all the posts.

As to scanner flare (bloom), this is a somewhat known problem. The scan
I was attempting was under-exposed so I had the gain cranked up, which
I believe in the Nikon's means higher LED output. I'm not sure if it
comes from the scanner optics or the fact that if you have a very
bright area right next to a darker shadow area, the CCD may bleed
through causing bloom when you over saturate part of the CCD. I suspect
if it is the CCD it would occur in the linear direction of the CCD
array, while if it were scanner optics, it would be unidirectional?

Here is a crop of the horse's head with bloom/flare (LS-4000ED):
http://www.zuik.net/om/horse_crop_rhp_0902_9b.jpg

At first I thought the problem was the film, but turns out to be the
scanner. The direction of the scanner array in this case would be the
worst for CCD bleeding, but I would not rule out the optics.

for reference, the overall shot is:
http://www.zuik.net/om/horse_rhp_0902_9b.jpg

I've heard that the Minolta scan multi pro is better than the Nikon
scanners in this regard. There is some discussion of the 'flare' at
http://www.imaging-resource.com/SCAN/DSMP/DSMPICS.HTM

Wayne

At 11:32 PM 9/14/2004, Moose wrote:
>Remember, this all started about resolution, not what looks better. C.H. 
>has pulled it back from other directions a couple of times before 
>talking about relative looks of the 2 media after I did this comparison. 
>I didn't try to make anything "appear better" in any artistic sense. I 
>just used PS tools to bring up as much detail as possible to make 
>resolution comparisons between the 2 media sort of fairish.


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