Re: DSLR vs. Drum/PMT gamut
Re: DSLR vs. Drum/PMT gamut
- Subject: Re: DSLR vs. Drum/PMT gamut
- From: Roger Breton <email@hidden>
- Date: Sun, 21 Aug 2005 14:52:59 -0400
> I'm sure I do not have grasp of a concept or two here, but from everything I
> have learned a drum scanner should be able to out perform a DSLR or PhaseOne
> capture as far as D-range and gamut.
>
> What is going on here?
> What am I missing?
>
> TIA for the education.
> --
> Douglas Rhiner
All profiles represent color in Lab or XYZ. A drum scanner does not have a
gamut of its own but rather depends on the particular photographic emulsions
in is taking in (Fujim, Ekta, etc.). DSLR, on the other hand, depend on how
they're used : if they are used to make some ICC profile then it's because
we've captured their response to some physical colorant space like that of a
ColorChecker chart, but they are used to capture real scene imagery then,
AFAIK, there is no saying how it's bound internally to the scene colorimetry
because it's hard to get at the detector's raw response.
In practice, a more useful approach to characterizing DSLR would be to
derive their spectral responsitivities. But that's hard to do and how is
that put to good use depends on concepts I have not quite grasp yet as I
have never had the chance to shine a constant beam of monochromatic light at
my D100 spanning the whole visible spectrum and noting the camera rgb
response, ploting them on a graph and use that as a true colorimetric
transform of my camera.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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