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

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Subject: [Leica] Re: "the dynamic range of digital"
From: telyt at (Douglas Herr)
Date: Tue Sep 19 22:43:35 2006
References: <003801c6dc6c$f44c0800$6501a8c0@asus930>

On Sep 19, 2006, at 9:26 PM, G Hopkinson wrote:

> Robert, I understand the linear part and the 50% of tones within the 
> first (brightest) stop. I don't follow why UNDER exposure
> causes loss in that stop. Isn't the underexpose method meant to 
> preserve as many of those tones as possible? Then you are going to
> adjust your tonal range after capture so that the 256 possible are 
> chosen from the ones you have captured. In other words, a nice
> smooth histogram with no gaps after you manipulate the image. I think 
> this is the key point not being considered and resulting in
> the polarised viewpoints. Not what the file will look like un-altered 
> afterwards to compensate for the underexposure, but how many
> tones you have captured. If a "normal" exposure results in clipping 
> say half of the brightest f stop approaching 255, aren't you
> losing far more tones than clipping half a stop from the bottom 
> approaching 0?
> There must be something I am missing here, and I really want to 
> understand.
> Cheers
> Hoppy

No Hoppy you're not missing anything.

Doug Herr
Birdman of Sacramento

Replies: Reply from leica at (Dave Mason) ([Leica] Re: "the dynamic range of digital")
In reply to: Message from hoppyman at (G Hopkinson) ([Leica] Re: "the dynamic range of digital")