Hi David,
How can a scanner have superior spectral response to a Bayer camera?
Unless all the sensors seen the same thing, they aren't seeing the same
thing. In a Bayer pattern sensor, each sensing element is seeing
different
light, unless there is a filter over the sensing elements that
From: Austin Franklin
Lower noise? What you are calling lower noise is dubious. Perceived
lower noise does not mean higher fidelity. How do you know it's lower
noise? Have you actually done a comparison of it to the original image
scene to see what was noise and what was not? The Bayer
David,
I think you have pre-judged the issue and are mixing emotional rhetoric with
supportable and reproducible/verifiable results.
your arguement that on a 'pixel level' film scans aren't the same quality as
10D images is a prime example.
a) its not clear what comparison metric you are using
b)
Karl writes,
But the claim that a 10D is better than film isn't supported
by the math or by visual inspection
That wasn't my claim: my claim was that 900x900 pixels of a 1Ds image look a
lot better than 900x900 pixels of a 4000 dpi scanned image if you print them
at the same size. Please don't
Hi Paul,
Lower noise? What you are calling lower noise is dubious. Perceived
lower noise does not mean higher fidelity. How do you know it's lower
noise? Have you actually done a comparison of it to the original image
scene to see what was noise and what was not? The Bayer pattern
my claim was that 900x900 pixels of a 1Ds
image look a
lot better than 900x900 pixels of a 4000 dpi scanned image if you
print them
at the same size.
David,
Your terms are amorphous. looks a lot better in what regard? What may
look a lot better to you, or to anyone else, may not look a
From: Austin Franklin
Blue sky is hardly noiseless. That doesn't mean that there can't be other
sources of noise, some more significant than others, of course, but to
assume that there is simply no noise in a blue sky is, IMO, a bad
assumption. Do you have any actual data to back up this
Hi Paul,
when you look at the sky, you don't.
How do you know you don't?
But the point is that
the amount
of noise you get in the digital image depends upon the hardware, so it
obviously can't all be actual noise coming from the sky. My old
DiMage 7 is
_very_ noisy, even at ISO 100. My
From: Austin Franklin
How do you know you don't?
I dunno. How do I know this isn't all a dream?
But that doesn't mean that every combination of film/scanner has
noticeable
noise generated by these things in sky regions.
I assume drum scanners do much better, but they're a heck of a lot
This discussions seems to have turned into how many pixels can dance
on the head of a pen or as Brian Eno put it long ago: the heuristics
of the mystics. Might I suggest that those of us who want to continue
the discussion do so privately?
Ellis Vener
Disclaimer: This e-mail is intended to
Hi Paul,
But that doesn't mean that every combination of film/scanner has
noticeable
noise generated by these things in sky regions.
I assume drum scanners do much better, but they're a heck of a lot more
expensive than a Canon Digital Rebel.
As do high end CCD scanneras as well, and
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