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RE: filmscanners: Scanner resolution (was: BWP seeks scanner)



Mmh... I think we're talking about different things: the red channel has
often the best contrast in *color* images, given the high percentage of blue
(skies, water) and green (grass) in nature, but that's not inherent to the
scanning process. If we scan B&W film, we should (theoretically) have the
same information in all of the three channels. I knew the blue channel was
prone to noise, but softness in the red is a new (and precious) information
to me. I will still use it when converting from color to B&W, but not when
scanning B&W.
(Or am I totally wrong and you mean the red channel has better contrast even
when scanning B&W? That doesn't show in the images published in John
Brownlow's site, though, at least not to a significant extent)

Regards, 
Alex Pardi

-----Original Message-----
From: rafeb [mailto:rafeb@channel1.com]
Sent: luned 18 giugno 2001 01.23
To: filmscanners@halftone.co.uk
Subject: RE: filmscanners: Scanner resolution (was: BWP seeks scanner)


At 03:15 PM 6/16/01 +0100, you wrote:

>On Fri, 15 Jun 2001 15:52:51 -0400  rafeb (rafeb@channel1.com) wrote:
>
>> This is odd.  If it were me, I'd toss the blue channel, 
>> which is more often than not the one with the most noise 
>> and the least usable information.
>> 
>> The red channel, OTOH, is the one with the best contrast, 
>> almost always.
>
>:-) The green channel is the one most often used for single-channel 
>greyscale scanning.


Yes, I believe that's the case.  I guess my point 
was that red had (has) the best contrast, not 
necessarily the best sharpness.  But it might be 
too much contrast for practical purposes.

Green is more or less the middle of the visible 
spectrum.


rafe b.




 




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