Thanks for the footnote. I learned something here. In thinking of
color negative's ability to capture a wide range of subject brightness I
hadn't mentally translated the mapping of that range into a smaller film
density range and thus into a smaller DMax requirement on the scanner.
I should have since Ctein's book on photo restoration makes a similar
point on scanning prints. Since prints have a low brightness range
neither high DMax (nor high resolution) are particularly important in a
flatbed scanner used for restoration image capture.
Chuck Norcutt
Moose wrote:
>
> * Assuming for simplicity that the scanner is capable of capturing the
> whole range of densities on the film. This is not a practical problem
> with color neg film, as the density range is considerably smaller than
> for slide and conventional silver B&W film, due to the orangeish mask in
> CN film. CN captures a wider range of subject brightness than reversal
> film, but maps it into a smaller film density range. As an aside, this
> means that the search for the scanner with the highest DMax is not
> important for CN film, but hardware resolution of density differences
> and a bit depth of output to contain that detail that are more important.
>
> It also assumes that the scanner is profiled, which is at issue in other
> parts of this thread, but not at issue in this theoretical example.
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|