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[OM] Re: Latitude of exposure with an E-thing

Subject: [OM] Re: Latitude of exposure with an E-thing
From: Moose <olymoose@xxxxxxxxxxxxxxx>
Date: Sun, 25 Sep 2005 03:19:48 -0700
iddi wrote:

>On Sun, 25 Sep 2005 02:39:57 -0700, Moose <olymoose@xxxxxxxxxxxxxxx> wrote:
>
><big snip>
>
>  
>
>>The question that I don't know the answer to is why there isn't a JPEG12
>>image format. The amount of extra programming effort to carry 12 bits,
>>rather than 8 or 16, should be trivial.
>>
>>Moose
>>    
>>
>
>Does it matter that RAW is 12bit linear while JPG is 8bit log? Some  
>photography website had an article about this (no, it wasn't L-L.com, but  
>someone else, ken something?)
>  
>
I believe the JPEG spec only defines how an image is represented in the 
file format. I don't believe it says anything about the mapping of 
higher brightness resolution images into its 8 bit space. How the data 
is created is the business of the creators, not the file format. No 
matter what algorithm/curve is used, mapping 12 to 8 bits loses data.

Moose



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