Re: Art Duplication
Re: Art Duplication
- Subject: Re: Art Duplication
- From: John Castronovo <email@hidden>
- Date: Sun, 20 Sep 2015 23:17:39 -0400
- Importance: Normal
It's no more difficult than with anything else actually. It all depends on
the fixtures and distance, but it's never possible for lighting to be
perfectly even anyway, not to mention the problem of cosine fourth falloff.
I believe that the ultimate solution to even reproduction lighting is to use
an approach like the software made by Robin Meyers called Equalight, but
nothing is perfect - maybe the sun which is a point source from 93 million
miles away. A polarized 2,000 watt Fresnel spot from 25 feet away was
surprisingly even on sheet film back in the last century, and that was due
to the distance from the spot to the original.
johnc
-----Original Message-----
From: Roger Breton
Sent: Sunday, September 20, 2015 9:42 PM
To: 'Iliah Borg'
Cc: email@hidden
Subject: RE: Art Duplication
Illah,
How do you get uniform illumination with halogen bulbs?
/ Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden
[mailto:colorsync-users-bounces+graxx=email@hidden] On
Behalf Of Iliah Borg
Sent: 18 septembre 2015 20:33
To: Don Hutcheson <email@hidden>
Cc: email@hidden
Subject: Re: Art Duplication
Of all the art galleries I’ve trained to do art capture, the most
successful (by far) were those I persuaded to use plain old hot,
inefficient, but beautifully continuous-spectrum tungsten or halogen
bulbs, suitably heat-filtered to avoid melting too much paint!
My experience, too. No SoLux filtered, just halogen lights. Things to
control tightly are flare and polarization. Flare messes with colours,
especially if the profile is based on 3-D LUTs
We profile from a target made with the oil paints, measured by a spectro.
As to profiling, one can make Argyll behave in colorimetric mode rather than
in "pleasing".
--
Best regards,
Iliah Borg
LibRaw, LLC
www.libraw.org
www.rawdigger.com
www.fastrawviewer.com
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