Re: filmscanners: What appears in Vuescan preview (was: analog gain)

["shAf" <michael@shaffer.net>]

Bob writes ...

> >I don't know about the 'analog gain', but I previewed 3 times
> >last night, on the same image, and none of them picked up the
> >'clean' function. ..., but the final scan
> >came out beautifully clean. It would be nice if the 'clean'
> >functions worked on the preview, ...
>
> It used to.  The Restore colors, Clean and Sharpen
> functions were changed in Vuescan 6.6.1 to only change
> (show result in) the scan, not show in the preview display.
>
> There was a good bit of discussion near that time
> on the utility of the preview.  I recall that Ed wrote
> that its only purpose was for cropping, not to evaluate ...

    How can you expect the clean function to work correctly and
predictably, unless VS scanned at high res for the preview.  I don't
believe anyone wants this ... the preview scan should be quick and
dirty (... so to speak ...*smile*...)

    Here is what you can do however.  Crop the preview as necessary
... and do a "scan device" and write no files ... subsequent "scan
memory" commands will show you how effective the "clean" (and other
parameters) are affecting the scan.  If you are scanning into a color
space much different from your monitor, the next thing to do is write
a 1/4 res JPEG with ICM embedded and view it in Photoshop (or some
other ICM savvy software).  If the color is finally perfect ... NOW
you can "scan memory" to a full res TIFF with the ICM embedded.

shAf  :o)