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Old July 4th 04, 08:53 PM
Bart van der Wolf
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Default Digital camera versus Digital Film Scanner


"Bob C" wrote in message
om...
I have spent a little time (too much) examining nagatives and slides
under a microscope, and found that there is a great deal of detail
that simply does not come out with normal digital printing you get at
most photo labs. A small object I can see on a negative will appear
as pixels on a print or .JPG file. I don't know what resolution is
required to get all the information, but I suspect it's not far short
of 4000 dpi.


If the low ISO film image was shot with a quality lens and preferably on
tripod, 6000 to 8000 ppi is more likely. Note that the scanning stage
introduces some optical (sampling and contrast) loss aswell, but part of
that can be restored by postprocessing. Optical printing will also introduce
small optical (contrast) losses, but they cannot be compensated.
See http://clarkvision.com/imagedetail/scandetail.html and
http://www.xs4all.nl/~bvdwolf/main/f...400/se5400.htm for some
practical examples.

Bart