Multi-spectral capture
Multi-spectral capture
- Subject: Multi-spectral capture
- From: José Ángel Bueno García <email@hidden>
- Date: Tue, 26 May 2009 12:33:42 +0200
Hello all:
I am looking for someone working in multi-spectral capture in art to
share her or his experience at Las Palmas de Gran Canaria University,
Canary Islands.
The previous work I made was with SINAR f and Kodak 4x5" slides, but
there is no way to access anymore to this kind of film or to E-6
processors.
At this moment have stopped the art catalog upgrade of the institution
due to some dubts with the capacity of institution´s Nikon D90, my
actual tool, to obtain the better digital record after some text
readings on multi-spectral capture.
Beside this, they pay me for my job and the day to day is made under
RAW (I prefer my own Pentax K10D because can work directly with DNG),
characterized with Adobe DNG Profile Editor, under D65 or A
iluminants, and proccessed with ACR with the only following readings
of ColorChecker: CC19 = 235, CC20= White Point. I´m trying to make a
"black hole" or to purchase the Spydecube to reach a constant black
point.
Previous to this, make photometric readings of the area to be
reproduced to grant light uniformity, calculate f and speed with
built-in photometer over a digital (?) gray card from
ColourConfidence, and white balance when under A illuminant (Nikon
manual advises to make white balance at 0, like if white card was a
grey card), and shot the CC over the original to reproduce at first
and to the end of the job. If neccessary I do that every day for
consistency for a large number of artifacts, usually watercolour paper
with colour and graphite pencils, and watercolour. Notice that a
compensation of exposition is made to avoid clipping in higher values
(-2/3) and the obteining readings from built-in photometer are about
+2/3 or 1 point ensuring the neccessary ETTR, IMHO.
On ETTR and scene-referred, use to change betwen the three
photometrics reading options of built-in photometer depending on scene
contrast and interest area and follow the recomendations from ICC
about "Creating scene-referred images using Photoshop CS3" and works
really fine.
At last, and again, anyone experienced in multi-spectral capture with
the related tools is interested in share knowledge?. Under paymeny, of
course.
Salud
Jose Bueno
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