Re: Scan Backs
Re: Scan Backs
- Subject: Re: Scan Backs
- From: Terry Wyse <email@hidden>
- Date: Thu, 18 Jul 2002 18:29:37 -0400
on 7/18/02 1:07 PM, Dick Busher wrote:
>
I have done tests where other photographers have sent me their digital capture
>
file, and their film shot with the same camera/lens. So far, in tests done to
>
date (actually only a couple) my scans of their films were better than their
>
digital captures, IMHO. However, I am always willing to be proven wrong.
Etc., etc......
I find this topic fascinating and of great interest. A couple of
points/questions:
* Isn't it true that transparency films only have a real dynamic range of
about 5-7 stops compared to high-end digicams with 10+ stops? The scan of
film might look great compared to the "original" but that film has already
compressed the original scene by several stops, no?
* What's the practical "resolution" of transparency film, say ISO 100-200? I
thought I heard many years ago that any scanning resolution greater than
about 4,000dpi was beyond the resolution of the grain itself. True or are
toady's films much better than that? So a file size of about 1-1.5GB would
appear to be the practical limit of capturing real detail.
>
In the final analysis the proof is in the pudding.
Good point. Back in my RIP training days, I used to do tests for folks and
show them the relative relavence (now there's a combo!) of text resolution.
We used to output film/proofs and sometimes press sheets where we'd RIP the
job from, say, 3600dpi down to about 900 dpi. Put a 12x lupe on the film and
above about 1800dpi was almost indistinguishable. Put it on press and even
900dpi looked as good as the higher rez type. My point is, I wonder how much
of that extra detail and resolution with images really makes it to the press
sheet or even to the proof. Could I see the diff between a high rez film
scan vs. a good digital capture? Maybe, maybe not.
Good topic! I hope it continues some more.
Terry
_____________________________
Terence L. Wyse
Color Management Specialist
All Systems Integration, Inc.
http://www.allsystems.com
email@hidden
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