Archived posting to the Leica Users Group, 2012/03/21

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Subject: [Leica] B&W Leica?
From: henningw at archiphoto.com (Henning Wulff)
Date: Wed, 21 Mar 2012 23:41:20 -0700
References: <CAFuU78diOn7i883gyJeKFMQ7OYfC21OdMmHXhVfL9MyKgGM2dA@mail.gmail.com> <CB8E7277.106E8%chris@chriscrawfordphoto.com> <20120321174752.GA728@selenium.125px.com> <6FE59497-E5B8-4C9C-B88A-B4A9CB1F073C@gmail.com> <20120321190715.GD728@selenium.125px.com> <CAFuU78eAzbpHnRdXXJV_9Djhzsg9_qU-epGbK17GFypU+T_gKQ@mail.gmail.com>

Not quite. Boosting in software emphasizes noise. So it's better to have two 
green pixels, so that the higher value of green required doesn't require 
boosting the green 'one ISO value' up.

This is also the reason that when testing very high ISO performance, the 
blue channel is usually the one with the most noise. That's because most 
'available darkness' shots are taking at colour temperatures well below 
5000?, so to get reasonable white balance the blue channel has to be 
seriously amplified, meaning it has little dynamic range left and a lot of 
noise compared with the red channel, or the green channel which starts out 
with twice the 'power'.


On 2012-03-21, at 9:44 PM, Lew Schwartz wrote:

> I'll just throw this into the I-don't-really-get-it mix: If the
> sensors are deficient in registering any part of the spectrum, it
> seems to me that it'd be pretty easy to compensate in the firmware
> before or after writing it into storage.
> 
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
> 


Henning Wulff
henningw at archiphoto.com






Replies: Reply from tgray at 125px.com (Tim Gray) ([Leica] B&W Leica?)
In reply to: Message from lew1716 at gmail.com (Lew Schwartz) ([Leica] B&W Leica?)
Message from chris at chriscrawfordphoto.com (Chris Crawford) ([Leica] B&W Leica?)
Message from tgray at 125px.com (Tim Gray) ([Leica] B&W Leica?)
Message from steve.barbour at gmail.com (Steve Barbour) ([Leica] B&W Leica?)
Message from tgray at 125px.com (Tim Gray) ([Leica] B&W Leica?)
Message from lew1716 at gmail.com (Lew Schwartz) ([Leica] B&W Leica?)