Archived posting to the Leica Users Group, 2013/10/27

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Subject: [Leica] M9 gotcha
From: scottgregory at (Scott Gregory)
Date: Sun, 27 Oct 2013 11:23:52 -0400
References: <682AEF14A4CABCC240025B87@Visible-Trout.local>

Brian I for one did not know that either. 
I took a Leica sponsored M9 course in Toronto a coupe of years ago and there 
was a lot of discussion centred around this topic of using the compressed vs 
uncompressed settings and I remember the Leica USA rep saying it was always 
best for optimal picture quality to leave the camera in uncompressed mode as 
that was what the Leica engineers developed for best quality. However there 
was absolutely no mention of the bit rate dropping as a result. Interesting 
and thanks for pointing out!


> On Oct 27, 2013, at 10:45 AM, Brian Reid <reid at> 
> wrote:
> This weekend I learned, the hard way, that if you ask an M9 to produce 
> compressed DNG files it only keeps 8 bits per pixel. If you want the full 
> 14 bits per pixel that the sensor records you have to store uncompressed 
> DNG.
> I didn't read the documentation as closely as i should have. Not that the 
> documentation is explicit about this. On page 174 of the English-language 
> manual it says that DNG compression is achieved "by non?linear reduction 
> of color depth".
> Foo. Next time I'll get this right.
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In reply to: Message from reid at (Brian Reid) ([Leica] M9 gotcha)