Re: Colorsync-users Digest, Vol 4, Issue 376
Re: Colorsync-users Digest, Vol 4, Issue 376
- Subject: Re: Colorsync-users Digest, Vol 4, Issue 376
- From: MSP Graphics <email@hidden>
- Date: Fri, 19 Oct 2007 13:23:17 -0700
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Message: 3
Date: Fri, 19 Oct 2007 10:51:28 -0700 (PDT)
From: Randy Zaucha <email@hidden>
Subject: Re: Fine art reproduction...was: Recommendations for Spectro
and
To: Roger Breton <email@hidden>
Cc: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset=iso-8859-1
Yes, I experimented with this using paint chips supplied by the
artist's highlighting department. I had a grayscale painted for me
to add to the chips. The profile looked good but I did not have the
time to test it on too many live paintings. It was an option we did
not use since we ended up beta testing HP Artist camera repro
software.
At least the theory makes some sense. Digital cameras are essentially
three-band colorimeters, not multiband spectrophotometers, and their
RGB spectral sensitivities cannot be aligned to human visual response
for all possible colorants. There will be metameric failure with
certain paints, dyes, etc., as the camera may not "see" these as we
do. It's slightly worse with a film-based workflow, as you must cope
with the film's sensitivity and then the scanner's (where it helps to
profile using a target made on the same film as the photograph). So
if one spectrally measures a target made of the same paints as the
artwork and base the profile on that there is a clear advantage. But
in practice a studio encounters a huge variety of artwork made with
different paints, dyes, inks, and other colored materials. This
painting has cadmium oranges and iron-oxide blacks, zinc white, the
next will have alizarin crimson, Hansa yellow, and titanium white,
the next something else, the next offset inks. They could even all
visually match but will be spectrally different and record
differently. In this situation one can't know what the colorants will
be and can't make a meaningful profiling target. The only solution is
to adjust your system as best you can and then manually edit the
color. I have encountered oranges or greens that reproduced as brown,
even as all the other colors looked accurate; my only recourse was to
locally change the color in Photoshop. This is just part of the
craft; the key as always is to charge extra for the service!
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