Re: Scan Backs and Painting Copies
Re: Scan Backs and Painting Copies
- Subject: Re: Scan Backs and Painting Copies
- From: Roger Breton <email@hidden>
- Date: Sun, 21 Jul 2002 12:58:50 -0400
Tony,
In case you did not know, the London Art Gallery is using a special custom
designed 7 channel color scanback to capture all its collection. That
special camera was developped in colaboration with the Munsell Color Science
Laboratory of Rochester, NY. It is using a proprietary spectral matching
approach to convert to 16 bits RGB for archiving. They have studied the
spectral signatures of pigments used in the paintings like cobalt blue and
others. Therefore, their approach does not suffer from shortcomings in
spectral sensitivity of commercial scan backs like the PhaseOne, BetterLight
and others.
The results are phenomenal.
The work was conducted by Dr. Roy Burns. I believe you can browse some of
the papers he published on this project on his web site and around the IS&T
site.
Roger Breton
Laval Qc
>
This is my first posting to the list, being an imaging science student
>
preparing a dissertation on digital reproduction of paintings. I understand
>
that the ccd's in scan backs are often based on scanner technology, and as
>
such are optimised for cmy (dyes) color accuracy, not rgb. This would mean
>
good color accuracy for photographic artwork, but not for pigments. An area
>
array ccd in a digital camera will give far better color accuracy. Imaging
>
scientists describe the two different responses as 'densitometric' (cmy) and
>
'colorimetric' (rgb).
>
>
Some pigments are known problem colors for (particularly digital)
>
reproduction. I would be very interested in hearing about list members
>
experiences of problems with getting accurate color.
>
>
Thanks
>
>
Tony Riley (Kendal, UK)
>
email@hidden
>
www.tonyriley.dsl.pipex.com
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