Re: Color of a rose...
Re: Color of a rose...
- Subject: Re: Color of a rose...
- From: Graeme Gill <email@hidden>
- Date: Thu, 04 Jun 2009 12:46:58 +1000
Sean wrote:
Would you be kind enough to describe to me your impressions of how reds and yellows
differ between bayer and foveon arrays? Avoiding demosaicing sounds appealing as I
would think that it would pull a layer of prefix interpretation out of the workflow.
In any case the analogy to film would end there no? Digital will never be anything but
natively linear.
The Bayer interpolation drawbacks are primarily about spatial aspects,
particularly moire and sampling artefacts, and has nothing
directly to do with spectral sensitivity or linearity.
The other differences to Foveon are the spectral
sensitivities, and it's more likely here that the Bayer will have
the advantage since the Foveon is at the mercy of whatever
the spectral filtering the silicon has, whereas a Bayer filter
can be selected to have specifically chosen filter characteristics.
I'm sure the foveon can be tweaked a bit with extra filters
in front of the silicon, but it can't change the overlap
between bands, and will be at the cost of sensitivity.
As for linearity, well if you avoid saturating the digital sensor,
you can then introduce whatever non-linearity you desire if
your aim is to emulate the non-linear characteristics of film.
Graeme Gill.
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