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Re: filmscanners: Vuescan long pass mode

In a message dated 2/8/2001 9:33:58 PM EST, bjs1@home.com writes:

> Are you sure it works on other CCDs ?

Yes, with varying degrees of success.

>  For example I used a pin and poked three different size holes in a very 
>  Provia 400F slide.   The 2 pixel hole showed no charge bleeding, the 10
>  pixel hole showed medium charge bleeding and the 40 pixel hole showed a far
>  amount of bleeding.   In all cases, the red seemed to bleed more than the
>  green which bled more than the blue.  Also the bleed seems to be only in 
>  direction.

Yes, other people have reported these same characteristics of the
CCD in the Canon FS2710.

I've been saying on this mailing list for more than a year that
overexposing the CCD would have charge bleeding problems.
This limits the usefulness of the long exposure feature on
some scanners.  It's a hardware limitation, and there's not a
lot I can do to work around it.

Ed Hamrick


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