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RE: filmscanners: Supra 400 shadows

Ah-hah!  That makes perfect sense.  The speckles are too bright and pure to 
come from the film itself.  It's reasonable to assume they're an electronic 
artifact, and aliasing is the likely culprit.  That also explains why boosting 
the black point will reduce them but not eliminate them.  They're so bright 
that you need to throw away a lot of shadow detail to hide them.  Thanks, Tony. 

That still leaves the question of what to do about them - short of waiting for 
a 6000 dpi scanner, of course.


-----Original Message-----
From: TonySleep@halftone.co.uk [mailto:TonySleep@halftone.co.uk]
Sent: Thursday, August 02, 2001 12:18 PM
To: filmscanners@halftone.co.uk
Subject: RE: filmscanners: Supra 400 shadows

On Wed, 1 Aug 2001 11:44:30 -0700   Paul Chefurka 
(Paul_Chefurka@pmc-sierra.com) wrote:

> I have the exact same problem with Supra 400 - red and green speckles in 
> the shadows.  Like you, I can't get them to disappear without blowing 
> away a lot of shadow detail.  I don't know if a drum scan would solve 
> this or not - I've seen the same problem on both my SS4000 and my new 
> LS-4000, so I have my doubts.

This is likely to be grain aliasing. Where exposure is slight, there aren't 
many dye clouds (grains), and if they are of a size to alias individual 
pixels or small groups, false colour is the outcome.


Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info 
& comparisons


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