Thanks Markus and Marie-Noëlle.  I am learning quite a bit!
One last question.  How can I find out which values are applied by
default in the sharpen and base curve modules?  Or more generally, how
can I re-apply the default presets?  For the base curve module there are
a "canon eos like" and "canon eos like alternative" presets, while for
the sharpen module there is a "sharpen" preset (I have not created any
preset of my own).  Are these the ones that get applied?
Thanks again,

Julian     

Markus Jung writes:

> Hello Julian,
>
> those modules sharpen and base curve are applied automatically to
> approximate the look of a out-of-camera JPEG file. Every digital camera
> with a bayer-type sensor does some processing similar to sharpen
> (because a de-bayered image looks quite "soft" first) and base curve (to
> adjust the sensor response curve and enhancing the image contrast)
>
> Like Marie-Noëlle already explained, the only way to prevent those
> modules to be applied or to change their defaults is to create an own
> auto-apply preset with more camera-specific matchings, this one will
> take precedence over the built-in ones.
> See http://www.darktable.org/usermanual/ch03s04s04.html.php for more
> informations regarding presets.
>
> Regards,
> Markus
>
> Am 06.10.2013 01:46, schrieb Julian M. Burgos:
>> Dear list,
>> 
>> My apologies for what it is probably a very basic question.  I noticed
>> that when I import pictures from my Canon 40D, when I go to darkroom
>> mode the pictures have two modules already applied that show up in the 
>> history: sharpen and
>> base curve.  This only happens with sRAW pictures and not with JPEG's.
>>   
>> What is going on? Is Darktable detecting steps that were done by the
>> camera?  Or are these default steps applied to sRAW images?  If so, how
>> can I change them?
>> 
>> Thanks for the clarification, 
>> 
>> Julian
>> 
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>
>
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-- 
Julian Mariano Burgos, PhD
Hafrannsóknastofnun/Marine Research Institute
Skúlagata 4, 121 Reykjavík, Iceland
Sími/Telephone : +354-5752037
Bréfsími/Telefax:  +354-5752001
Netfang/Email: [email protected]

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