[Digikam-users] jpeg from DSLR workflow: to 16bit or not

[Leonardo Canducci]

2009/9/23 Gilles Caulier <caulier.gilles at gmail.com>:
> This is a wrong workflow. JPEG is always 8 bits encoded...
>
> Use RAW format instead. encoding is > 12 bits... But you need to
> postprocess image as your camera do...
I know jpeg is 8bit but stretching histograms in 16bit color space
should avoid posterization anyway. read the third tip at the end of
this page:
http://www.cambridgeincolour.com/tutorials/posterization.htm
>
> Gilles Caulier
>
> 2009/9/23 Leonardo Canducci <leonardo.canducci at gmail.com>:
>> jpegs from my nikon d50 have 8bit color depth (as any jpeg AFAIK) but
>> I read that if I plan to edit the histograhm with tools like levels or
>> curves I'd better use 16bit color depth to avoid posterization, even
>> when the source is 8bit. Is that true? What's the best way to handle
>> this tools minimizing quality/information loss when source is a 8bit
>> jpeg? Should I load the jpeg, then switch to 1bit, then edit (curves,
>> levels) and the export back to jpeg?
>>
>> Thanks!
>> --
>> Leonardo Canducci
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-- 
Leonardo Canducci