Digital BW, The Print

Hi Austin,
 
thanks for your answer.
My statement is that I think that all scanners can change exposure time
based on their analysis of the piece of film they're fed (i.e. they
calculate what they think is the correct exposure time). What I'm not sure
is whether or not all models provide an interface to allow the end user to
override the exposure time chosen by the scanner. Vuescan has the "lock
exposure" checkbox to precisely do this, but I can't tell if this is enabled
on all scanners.
As for raw scans, Kevin Gulstene (which I was responding to in my post
below) said "It's hard to say for sure how raw raw is.  It is software
dependent.", and I replied about what you wrote here, that what I care about
is that there's no white/black point setting, curves or levels (i.e s/w
manipulations) applied to the raw data.
 
Alessandro

-----Original Message-----
From: Austin Franklin [mailto:darkroom@...]
Sent: Thursday, May 29, 2003 16:50
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: RE: [Digital BW] Re: Scanning


Hi Alessandro,

> What I actually meant about scanners capability to change exposure time is
> that I think they have it at least internally, i.e. they can adapt to
> different images: whether or not this setting can be modified by
> the user is
> another matter

Can you say what you mean by this?

> As for the question "How raw raw scans are?" (we're getting philosophical
> here :-), I assume it is the result of step 1 in the scanning process you
> defined.

Sorry, I wasn't paying attention.  Raw scans are precisely the data out of
the A/D, but "justified" in a 16 bit space, if the A/D is over 8 bits.
There really is no standard for this, but I'd believe that low bit
justifying the data might be the best way, as it's easier to work with for
setting setpoints.

The raw data does not have setpoints set, or tonal curves applied...

> Austin promised to give these matters a thought, but I'm afraid he's still
> on the "Digital, film, scanning" battlefield :-)

Nope.

Austin




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