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Re: filmscanners: VueScan and white pixel clipping SS4000

You might try a lower "Brightness" setting in Vuescan and different gamma
settings to deal with the highlight clipping.


----- Original Message -----
From: "Stan Schwartz" <snsok@swbell.net>
To: "Filmscanners (E-mail)" <filmscanners@halftone.co.uk>
Sent: Sunday, July 08, 2001 11:06 AM
Subject: filmscanners: VueScan and white pixel clipping SS4000

| I am making a scan of an array of bright azaleas using VueScan and an
| SS4000. I am scanning at 48-bits.
| I am not sure I understand the settings correctly in VueScan. My scanned
| images are showing a lot of burned out highlights. The Photoshop histogram
| shows a lot of bright pixel clipping off the the right side of the
| histogram, confirmed by Option_clicking the white triangle.
| I tried scanning in both white balance and autolevels. The Help
| says that I would be best with autolevels for this type image.
| Looking at other high brightness images, it appears I am getting a
| significant amount of clipping if I leave the white point setting at 0.5%.
| Even at white point set to 0.0%, there is a small amount of white pixel
| clipping.
| I am not clear what is accomplished by having the white point setting
| defaulted to 0.5%.
| One other thing the histogram shows: across the top of the histogram, even
| before I make any level adjustment, I am seeing about a dozen or so
| "whiskers". I understand why these show up after levels adjustments, but I
| am not clear why I am seeing them on the unadjust image.
| This clipping and the "whiskers" are not showing up when I scan with
| Polaroid's software.
| Stan Schwartz
| www.tallgrassimages.com


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