Re: filmscanners: Vuescan long pass mode

["bjs" <bjs1@home.com>]

----- Original Message -----
From: "Herm" <hermperez@worldnet.att.net>
To: <filmscanners@halftone.co.uk>
Sent: Saturday, February 10, 2001 2:20 AM
Subject: Re: filmscanners: Vuescan long pass mode


> charge bleeding is a characteristic of CCD sensors, once the electron
wells get
> filled up you get these vertical smears as the charge "bleeds" into
adjacent
> pixels..its a hardware problem, can only be solved by limiting the
exposure.

I agree it is a hardware problem but smart programmers have been working
around hardware problems for decades.

I have a Pascal program that takes N files at arbitrary exposure levels and
combines them into one "longpass" result.  It accounts for charge bleeding
and a number of other issues.  The result has none of the gross errors that
Vuescan currently shows and works far better.

I'd give it to Ed but the algorithms are proprietary.

People claiming the longpass results I'm seeing in Vuescan are the "best
that can be done using software" simply don't know what they are talking
about.

Byron