Re: DSLR vs. Drum/PMT gamut
Re: DSLR vs. Drum/PMT gamut
- Subject: Re: DSLR vs. Drum/PMT gamut
- From: Douglas Rhiner <email@hidden>
- Date: Mon, 22 Aug 2005 11:45:00 -0700
> 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.
Roger,
Thanks for the reply!
I think I was not in the proper communicative space when I posted my
question.
I am being a bit general here. Trying to grasp the over-all concept rather
than the idiosyncracies.
After a bit of musing on this subject, I think I have distilled my question
down a bit.
The ICC profiles for various digital cameras out there, be they profiles for
tungsten, day, or any other lighting scenario, consistently have
significantly more volume that the profiles from my drum scanner for various
film, Fuji, Agfa, Kodak.
Taking only my observations from this exercise, one could deduce the
only advantage a drum scanner has over a digital camera is it's resolving
power.
What is going on?
Does a DSLR have the ability to capture a greater color space than Fuji
Velvia for example
--
Douglas Rhiner
High Mountain Imagery
Technical Director / Owner
T 530-546-0413
C 530-362-0047
http://www.hmitahoe.com
?
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