Digital BW, The Print

I'm not sure where this comes from.  16 bits of data gives 2 to the power of
16 shades of grey, ie 65,536 of them.  Should be plenty to divide by 17
stops, particularly as the relationship between a stop and a set of shades
of grey is arbitrary - you can map them how you like with either the scanner
software or Photoshop.  What does surprise me is that Steve gets this from
an Epson V700, however I've seen some of his images and he does undoubtedly
capture a very large SBR with detail at both ends so I'm sure he's right.

David Whistance

-----Original Message-----
From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com]On Behalf Of Tom
Baker
Sent: 07 October 2008 22:04
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: Subject Brightness Range - branch from [Digital BW] Re:
Getting reasonable scan file sizes w/ MF & LF ...


But, anything over 16 can't be represented in a 16 bit tiff file.
\ufffd
TB


--- On Tue, 10/7/08, Steve Gledhill <stephengledhill@...> wrote:

From: Steve Gledhill <stephengledhill@...>
Subject: RE: Subject Brightness Range - branch from [Digital BW] Re: Getting
reasonable scan file sizes w/ MF & LF ...
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Date: Tuesday, October 7, 2008, 1:31 PM






Dana,

Not many images have that range \u2013 but lately I\u2019ve been photographing in
cathedrals where the deep interior shadows through to the sunlit stained
glass windows certainly have that challenge. So ... yes, I really do.

Steve Gledhill

www.virtuallygrey. co.uk <http://www.virtuall ygrey.co. uk/>

From: DigitalBlackandWhit eThePrint@ yahoogroups. com
[mailto:DigitalBlackandWhit eThePrint@ yahoogroups. com] On Behalf Of Dana
H. Myers
Sent: 07 October 2008 21:21
To: DigitalBlackandWhit eThePrint@ yahoogroups. com
Subject: Re: Subject Brightness Range - branch from [Digital BW] Re: Getting
reasonable scan file sizes w/ MF & LF ...

Steve Gledhill wrote:
> The next step requires the scanner to be able to scan high
> density negatives \u2013 or more specifically, areas of high density \u2013 the
> highlights. My Epson V700 does that for me. The scanner captures the
> whole range from clear film base to the maximum density of the negative
> and represents it in the TIFF file as a full range 16-bit greyscale
> scan. So the huge SBR in the original scene is \u2018compressed\u2019 (via my
> workflow) into the range my paper is capable of \u2013 i.e. maximum ink black
> to paper white.

Do you really capture 17-stops of range using a 16-bit TIFF?

Dana

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[Non-text portions of this message have been removed]


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