Hal V Engel wrote:
On Sunday 22 May 2005 01:10 pm, Bob Friesenhahn wrote:
Even though digital cameras are currently the rage, a traditional film
camera coupled with a high-quality negative scanner should be able to
produce images with much better dynamic range.
Bob is right on the money about the dynamic range of film. Let me add some
detail.
Most color negative films have 10 to 15 stops of dynamic range. Fuji Reala,
which I use, has 15 stops of dynamic range. This is way beyond what is
currently possible with single exposure digital technology which at best is
about 6 to 7 stops. Color slide film typically has a dynamic of 7 to 8
stops. In high contrast scenes shot with slide film you are either going to
blow out the highlites or you are going to lose shadow detail. You can not
have good detail in both shadow and highlites and this is clearly true for
single exposure digital technology. The old adage is expose for the
highlites with slide film and expose for the shadows with negative film. I
think that digital technology should be treated much the same way as slides
with respect to exposure.
This is certainly the case at the moment for popular imaging sensors,
but who knows how far the technology is going to go ?
See <http://www.kip.uni-heidelberg.de/vision/projects/hdr/divichi.html> for
one that claims 6 decades (ie. 20 stops) range.
See also
<http://www.kip.uni-heidelberg.de/vision/projects/hdr/sensorvienna.html>
for more interesting approaches.
A lower dynamic range, higher resolution (and perhaps lower noise) version
of such a sensor would give film a run for its money.
Graeme Gill.
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