Re: Colorsync-users Digest, Vol 2, Issue 351 - emissive Target
Re: Colorsync-users Digest, Vol 2, Issue 351 - emissive Target
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 351 - emissive Target
- From: "Stefan Steib" <email@hidden>
- Date: Tue, 13 Sep 2005 00:08:11 +0200
Hi Graeme
Thanks for the links, took a look, it´s real ;-)))), but as I said: once to
be done in the factory, not of any use
for picture taking.
Whereas I still wonder why the spectral response has to be measured inside
the camera.
I´m pretty shure that the technical (spectral response) specs are well known
to the chip manufacturer....?
The only sense I can imagine is to maybe check a compact camera with a fixed
mounted lens, any other
system with interchangeable lenses is going to have different values for
every other lens mounted....!
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
Yes it is real, see <http://www.imaging.org/store/epub.cfm?abstrid=32161>,
and I've seen a couple of the prototypes at the 12th CIC.
See page 6 of
<www.mpi-sb.mpg.de/~goesele/download/2005-02-23-IMPA-ColorCalibration.pdf>
for a photo of it.
The point is not to accommodate a scene, but to characterize the
sensor. It's quite difficult to measure the spectral sensitivity
of a sensor, short of having a tuneable laser source (which is
expensive and slow). By using the narrow band characteristics of
LED's as an emissive chart, the maths needed to compute the sensor
characteristic isn't too difficult, and the speed of calibration
is high. HP developed it for their camera production line.
Graeme Gill.
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