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[filmscanners] RE: IV ED dynamic range



Thanks for suggestion, but first of all I don't use Vuescan (tried it a
while ago, didn't like neither the result nor the interface).
Besides of that, I doubt there might be really discernable difference in
this manner between the IV ED and LS4000. Running both at 8 bit mode
(regular scan, no multisampling) both should produce similar results (I
don't think resolution differences can do something in regard of dynamic
range).
Am I wrong ?

Regards,
Alex Z

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Charlie
Sent: Wednesday, August 07, 2002 3:37 PM
To: alexz@zoran.co.il
Subject: [filmscanners] Re: IV ED dynamic range


Alex Zabrovsky wrote:
>
> Hi.
> Yesterday I scanned a few night scenic slides and was again a bit
> disappointed by insufficient dynamic range delivered by my IV ED. The
> original clearly shows fine details in shadows and even in dark areas
whilst
> the scan rendered this areas as almost black.
> Frankly, raising Analog Gain help somewhat revealing considerably more,
but
> then as you obviously realize there is impact on highlights.
> Although the manufacturer claims dynamic range to be about 3.6 (seems to
be
> derived just from 12 bit color resolution), but in practice I suspect it
> barely reaches 3.0-3.2.
>
> Photoshop Levels and sometimes Curves manipulation reveal much more
details
> in most cases which tells that that technically, the scanner is capable to
> perform better (since these details where there although being hidden in
> straight scan)
>
> I still hope I do something wrong and didn't get the most out of my IV ED
> (well I very seldom use 12 bit scanning, perhaps this is a problem ?)
>
> Regards,
> Alex Z
>

I've found it possible to improve the shadow details slightly by
multipass scanning the slide (using Vuescan). I doubt that it will
approach the results of an LS 4000, but I think you can easily see an
improvement.
--
Charlie Hoffpauir
http://freepages.genealogy.rootsweb.com/~charlieh/

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