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[filmscanners] RE: Terminology


  • To: lexa@lexa.ru
  • Subject: [filmscanners] RE: Terminology
  • From: "Kapetanakis, Constantine" <KAPETAC@polaroid.com>
  • Date: Tue, 7 May 2002 08:52:44 -0400
  • Unsubscribe: mailto:listserver@halftone.co.uk

That's correct. 48 bits is 16 x 3 (for RGB). However, i don't know of any
desktop scanner that gives you 16 bits per color. The Niko 4000ED, Polaroid
Sprintscan 4000+, SS45 Ultra SS120 all give you 14 bits and of course the
higher the bit count the better the dynamic range of the scanner (
theoretical maximum 4.2 Optical Density).  The Nikon IV and Polaroid ss4000
and SS35 Plus give you 12 bits per color.



-----Original Message-----
From: Wayne Simpkins [mailto:hsimpkns@memphis.edu]
Sent: Tuesday, May 07, 2002 7:05 AM
To: KAPETAC@polaroid.com
Subject: [filmscanners] Re: Terminology


On 4/26/02 5:15 AM, "Simon Lamb" <simon@sclamb.com> wrote:

> When Silverfast says it is outputting a 48-bit RGB file, am I right in
> presuming this is the same as other scanning software stating they output
a
> 16-bit RGB file?  Is Silverfast just multiplying the 16-bits by 3 for the
R,
> G and B channels, and in effect 48-bit is the same as 16-bit?
>
> I also assume if the above is correct that sofware stating 24-bit output
is
> the same as stating 8-bit output.

Simon,

That would be 8 and 16 bits/channel so 8/16 bit for grayscale and 24/48 for
RGB. "16 bit RGB file" is not very precise but they mean 16 bits/RGB
channel. 8 bit output = 8 bits/channel.


Wayne

--
Wayne Simpkins
The Univ of Memphis
Dept of Art

hsimpkns@memphis.edu

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