Archived posting to the Leica Users Group, 2007/01/11

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Subject: [Leica] M8 Article in LFI
From: grduprey at mchsi.com (grduprey@mchsi.com)
Date: Thu Jan 11 18:18:20 2007

Well considering the image quality seen to date, if there is some loss, the 
orignals prior to loss have got to be unbeleivably good.  I don't think I 
will even worry about it at all.

Gene


-------------- Original message from "Eric Korenman" <faneuil@gmail.com>: 
-------------- 


> right - That was my point from an earlier post. 
> The M8's 8 bit DNGs are derived by compressing the 14 bit CCD data. 
> 
> But does the M8's 'square root' compression technique sacrifice image 
> quality? 
> The LFI article would have you believe that there is no loss. 
> However the technique is inherently lossy. 
> 
> Any science / math types out there care to chime in? 
> 
> 
> Eric 
> 
> On 1/10/07, Alastair Firkin wrote: 
> 
> > > The DMR chip captures 14 bit directly into 16 bit DNG files. 
> > > Thats why DMR RAW filres are 20mb 
> > > And the 8 bit DNGs from the M8 are 10mb 
> > 
> > I do not believe so: the saving in space is done in the "compression" of 
> > the RAW file: the bit depth of the DMR and M8 are the same 
> > 
> > Cheers 
> > 
> > 
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> > 
> 
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Replies: Reply from red735i at earthlink.net (Frank Filippone) ([Leica] M8 Article in LFI: Lossy Algorithim)