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Re: filmscanners: Nikon Scan & VS Negative dynamic range

>From the Vuescan Help files:  "Crop Tab:

Buffer (%)   This is the size of the buffer area inside the cropped area to
ignore when computing the color balance of the image.  It is used to reduce
the effect of a small amount of black or white border on the overall image
color balance."

This may help.


----- Original Message -----
From: "Julian Robinson" <jrobinso@pcug.org.au>
To: <filmscanners@halftone.co.uk>
Sent: Tuesday, September 25, 2001 9:26 PM
Subject: RE: filmscanners: Nikon Scan & VS Negative dynamic range

| Alex
| At 23:01 25/09/01, you wrote:
| >I could try Vuescan and see if the white/black point settings actually
| >at scan phase, looking at the raw file (if this worked, it would also
| >me the benefit of 10 bits). I haven't had much luck with Vuescan until
| >but the latest release, which claims better results with negatives and
| >accuracy in the preview, is surely worth a try.
| I would try this - I really have a lot of difficulties with Vuescan, but
| DOES seem to work much of the time, and if I had the LS30 I'd use it by
| default as Rob does.
| That 10bits is apparently a real 10bits, and the black and white points do
| work IME.  There is sometimes a confusing problem though and that is it
| seems to get confused around the edges of the frame and will use the
| unexposed portion of the image in its black/white point measurement which
| is not very useful.  It seems that the cropping is not very accurate.
| I think Ed would make it much more user friendly if the exposure algorithm
| automatically applied a buffer which blanks out the outer 10% of the image
| from exposure calculations.
| Julian


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