Re: filmscanners: Vuescan - A few technical questions

["Chris McBrien" <chris@erg.abdn.ac.uk>]

Ed,
        don't you ever sleep. You were on-line when it was 9:30am. in
Scotland.

        Regarding that re-calibrate function for the CanoScan FS2700.

        It is not totally evident that the calibration cycle has been
completed. Any chance of a screen message to tell the user to insert
the media or something to that effect. No great rush.

Regards Chris.



----- Original Message -----
From: <EdHamrick@aol.com>
To: <filmscanners@halftone.co.uk>
Sent: Monday, March 05, 2001 10:30 AM
Subject: Re: filmscanners: Vuescan - A few technical questions


> In a message dated 3/3/2001 6:35:33 PM EST, jdn@bird9.com writes:
>
> > 1.  In the Color balance tab, what is the difference between
"Neutral" and
> >  "Auto Levels?"
>
> Neutral doesn't change the ratio of red to green to blue.  Auto
levels
> uses the brightest point to determine the ratio.
>
> >  2.  Also in Color balance, does "White balance" assume that the
lightest
> >  object in the image is white?
>
> No, it doesn't.
>
> >  Can it be used if there are no white objects
> >  in the frame?
>
> Yes.
>
> >  3.  When should Options/Long scan not be used.
>
> I'd recommend never using it - multiple passes works better.
> Lots of people asked me to add this option, but I don't think
> it works very well because of charge bleeding from overexposed
> pixels into nearby pixels.
>
> >  4.  How does Vuescan calibrate the scanner?  When I pull down
"calibrate"
> >  from the device menu, nothing seems to happen.
>
> This is only useful on some scanners, notably the PhotoSmart,
> Minolta SCSI scanners and Canon FS2700/2710,
>
> Regards,
> Ed Hamrick