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RE: filmscanners: VueScan and white pixel clipping SS4000



Stan,

Your computer (and most programs) can't deal with 12 bit packages of data,
so the program is converting it to the next larger package and pading the
top 4 bits for you. This has no affect of the image data - just just have 3
quarts and the closest bottle it can find is a gallon.

/fn

-----Original Message-----
From: owner-filmscanners@halftone.co.uk
[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Stan Schwartz
Sent: Sunday, July 08, 2001 8:03 PM
To: filmscanners@halftone.co.uk
Subject: RE: filmscanners: VueScan and white pixel clipping SS4000


Thanks.

What's OTT?

Also, I am actually scanning at 12-bits; that's the spec on the SS4000. PS
treats the image like a 16-bit.  Is that introducing any problem?

Any idea what the fairly evenly spaced "whiskers" on the histogram
represent?

By the way, I am not able to access your website. I am getting an
announcement message from the ISP, it seems.

Stan

-----Original Message-----
From: owner-filmscanners@halftone.co.uk
[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Tony Sleep
Sent: Sunday, July 08, 2001 6:20 PM
To: filmscanners@halftone.co.uk
Subject: Re: filmscanners: VueScan and white pixel clipping SS4000


On Sun, 08 Jul 2001 11:06:56 -0500  Stan Schwartz (snsok@swbell.net)
wrote:

>
> I am making a scan of an array of bright azaleas using VueScan and an
> SS4000. I am scanning at 48-bits.

Try a white point setting of 0.01% (0.0% is usually OTT), and adjust
Color|Image Brightness to a smaller number to give a duller, greyer
preview (hit Prev Mem after adjusting). EG, if currently 1.0, try 0.8
or so. This will avoid the clipping, and you can then adjust levels
precisely in PS.

Regards

Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner
info & comparisons




 




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