Archived posting to the Leica Users Group, 2006/09/19

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Subject: [Leica] Re: the dynamic range of digital
From: hoppyman at (G Hopkinson)
Date: Tue Sep 19 21:03:12 2006

B.D. I'm not trying to muscle in here, and I've never used a DSLR. I really 
want to understand better. I don't follow your
reasoning, here. I'd read that article before and reread it on your post. It 
seems to me that it supports what Doug is saying. By
slightly underexposing, are you not helping to preserve detail in that first 
lightest stop which has the most information? Then you
can adjust the tonal range later but you must preserve the detail in those 
highlights, those that aren't specular? Isn't Doug's
approach going to preserve more tones in the highlights and potentially lose 
less in the shadows? That is lose much less information
because of the linear performance of the sensors. Now just how much of that 
information you can actually reproduce in a print,
either near pure white or black is a different issue. As a practical matter 
your system obviously works for you and Doug's for his
subjects. There are clearly other factors at work.

I'm looking forward to learning more.

-----Original Message-----
[] On Behalf Of
B. D. Colen
Sent: Wednesday, 20 September 2006 12:58
To: Leica Users Group
Subject: Re: [Leica] Re: the dynamic range of digital

Being the digital expert you are, Doug, I would have thought that you'd know
that by under exposing a stop, you're throwing away everything at the top
end of the range - in the highlights - not the shadows - and 20% of the data
is in that top stop. But I don't use a DMR, so of course I know nothing
about digital ;-) - so don't listen to me, but do try reading this...from
the Luminous Landscape site....

> In my experience with the DMR, setting exposure comp to -.5 or -1
> sacrifices very little deep shadow detail if any.  It's not what I'd
> call a 20% loss of data.  The histogram (yes it's RGB) is nowhere near
> clipping at either end aside from specular highlights.  Perhaps B.D.'s
> 20% estimate is based on his experience with the E-1?
> Doug Herr
> Birdman of Sacramento
> _______________________________________________
> Leica Users Group.
> See for more information

Leica Users Group.
See for more information

Replies: Reply from bd at (B. D. Colen) ([Leica] Re: the dynamic range of digital)
Reply from don.dory at (Don Dory) ([Leica] Re: the dynamic range of digital)
In reply to: Message from bd at (B. D. Colen) ([Leica] Re: the dynamic range of digital)