Re: [Leica] Re: Color accuracy

["animal" <s.jessurun95@chello.nl>]

Mybe a cooled digital back on a Sinar would work?Rumour has it that they
have the largest range both colour and dynamic.
simon jessurun
- ----- Original Message ----- 
From: <LRZeitlin@aol.com>
To: <leica-users@mejac.palo-alto.ca.us>
Sent: Sunday, February 01, 2004 11:44 PM
Subject: [Leica] Re: Color accuracy


>
> In a message dated 2/1/04 7:52:45 AM,
owner-leica-users@mejac.palo-alto.ca.us
> writes:
>
> << I say color accuracy, but just yesterday, I found a color that not only
> film, but digital can't render right. I photographed a pariba
> tourmaline. The color is a very intense blue/green that is highly
> prized. Actually, you see the two colors depending on which angle the
> facets are in relation to the light. (We call it pleochroism.) The
> stone was nicely cut, no inclusions, and it was almost 7 carats - at
> about $20,000 per carat. Gorgeous. But I could NOT get my Canon D60 to
> get it right. And one of the best gem photographers doesn't seem to be
> able to do it with film either if any past photos I've seen are
> evidence. Photoshop at 16 bits couldn't get it right either, holding
> the stone up to the computer screen. The color is simply outside the
> gamut of any photographic process I have access to. >>
>
> The trouble is that most chemical and electronic color processes use only
> three fixed colors to form an image. They are all based on the
Young-Helmholtz
> theory of color vision that specifies that a minimum of three colors are
> necessary to specify colors. But there are some colors that the eye can
visualize
> that lie outside the range embodied by the three primary colors
incorporated in
> film layers or digital sensors. The human eye uses more than three types
of
> color sensors - but then nature is not constrained by accountants or
production
> engineers.
>
> Larry Z
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