Re: Re: SilverFast AutoIT8
Re: Re: SilverFast AutoIT8
- Subject: Re: Re: SilverFast AutoIT8
- From: Eldon <email@hidden>
- Date: Sun, 21 Sep 2008 13:38:35 -0500
On Wed, Sep 17, 2008 at 4:06 AM, Jan-Willem Rossee <email@hidden> wrote:
> you are right, you are now missing the exposure button in SilverFast
> 6.6.0r2. This was removed during the switch from Nikon's own NikonMaid
> drivers to a genuine SilverFast driver. As you may know the NikonMaid
> drivers are not fully compatible under Leopard --> official announcement -
> which is why SilverFast came up with our own drivers and introduced a
> different "exposure approach".
> It doesn't apply auto exposure to each new scan. As long as no adjustments
> are applied to the scan, a default exposure will be applied. If tonal range
> adjustments are applied via setting Dmin (whitepoint) in the histogram ,the
> exposure levels will be "controlled" accordingly. In simple words, there is
> no extra exposure control dialogue anymore, yet the exposure control is now
> synced analogue to the adjustments in the histogram dialogue. So when an
> image is "brightened up" via setting Dmin (whitepoint) in the histogram,
> SilverFast will automatically increase the exposure level in the scanner.
> One advantage of this workflow is that abberations like noise will not be
> increased when brightening up an image. How does this affect the
> (Auto)IT8-calibration in SilverFast? It really doesn't!
> Your scanner profile is still "safe" because since SilverFast is not a
> "icc-profiler-only" software it does have some advantages when it comes to
> profiling a scanner. One of them is that it takes the reference values of
> the chart literally, meaning there will be no gamut expansion / image
> optimisation applied during the calibration/profiling process. The
> calibration process is performed based on the standard exposure. You will
> still be safe with your SilverFast scanner profile even when changing the
> exposure of the scanner because brightening up an image will generally not
> change the color hue.
> I hope my explanation is helpful.
> Best,
> JAN
If you alter the individual color channels in the histogram, will
Silverfast adjust the exposure in each channel independently for Nikon
scanners? My particular scanner seems to have a problem with green
response which I am able to overcome in another scanning application
by boosting exposure (analog gain) in the green channel. A scan
without alteration in Silverfast has a significant magenta cast.
Also, when scanning in HDR (raw) mode, the histogram control is
dimmed. Does that mean there is no way to control the scanner
exposure when scanning to HDR?
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