Re: Colorsync-users Digest, Vol 2, Issue 350 emissive target+ NEC LED Display
Re: Colorsync-users Digest, Vol 2, Issue 350 emissive target+ NEC LED Display
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 350 emissive target+ NEC LED Display
- From: "Stefan Steib" <email@hidden>
- Date: Mon, 12 Sep 2005 13:16:50 +0200
From: Roger Breton <email@hidden>
Have you seen the upcoming "emissive" ColorChecker built with LEDs?
Regards,
Roger Breton | Laval, Canada | email@hidden
Hi Roger
I really doubt there will be such a thing as an emissive olor checker.
Why ? Well think yourself. As soon as you use emissive lighting values to
calibrate a
camera chip, all you really do is linearize to a spectral response curve of
the chip.
You do not collect a single bit of information about the illuminant of the
actual photographed scene.
This same statement also applies to a blackbox delivering "real black 0,0,0
" as well as an "absolute whitepoint 255,255,255"
delivering a "hole" in your picture. The actual value of these 2 points for
calibration is Zero.................
Camera calibration is much more complex than this. Without a spectral
response curve(can be done once in the factory),
metameric information and overall whitepoint calibration of the actual scene
you will get nowhere............
greetings from Munich
Stefan Steib
Gabelsbergerstr.48d
D-80333 München
tel.: +49 89 520 59 305
fax: +49 89 520 55 778
www.digitalfoto-trainer.de
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