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: Graeme Gill <email@hidden>
- Date: Tue, 13 Sep 2005 12:13:18 +1000
Stefan Steib wrote:
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.
Perhaps not, but good for profiling a device like a camera, scanner etc,
in a way that is independent of illuminants. That's the way reflective
profiling is currently done, and it generally adds a lot of flexibility.
Note that most practical device characterization using reflective
charts gives you a profile valid just for that lighting condition
with that media. By characterizing the sensor spectral sensitivity,
you have one of the necessary bits of information to compute a profile
for any lighting condition and any media.
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....?
In practice there is often a noticeable degree of device to device variation,
perhaps due to the nature of the color filters often used in conjunction
with the electronic sensors themselves. Being able to characterize each
individual device therefore produces more consistent product.
The emissive chart allows this to be done quickly and accurately.
Compared to the alternatives, an emissive chart is a very economical
technique to spectrally characterize input devices, and should make this
capability much more widely available.
Graeme Gill.
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