> * AFAICS in order to create an additional style to be only apllied when I
> want, I can do it from Lighttable: my style should only contains the
> *additional* transformation steps I need besides these defaults that are
> automagically applied.

Not necessarily, Darktable has a definite order in which modules are
applied and by default each module is applied only once. When you
apply a style that contains modules that already are in the history
stack you're not applying the module twice, you're just replacing the
original instance of the module by the new one in the style (possibly
with different options).

The only (kind of) exception to this is for modules that Darktable
allows you to apply multiple times (denoise, for example). In those
cases the style will only superseed the module version with the same
name: "denoise" will only replace "denoise", "denoise 1" only "denoise
1", etc.

> * I notice that some sort of "default style" is applied automatically when a
> new collection is created (e.g. when I open a folder with Darktable). How is
> this default style defined? Currently it applies three transformations:
> sharpen, orientation and base curve.

As far as I know you can't modify this default style. However, you can
define your own style in which the modules you don't want are
explicitly turned off (included with the word "off" besides them) and
apply it to all imported pictures. As described above this will
effectively remove them from the development stack.

> * How to completely wipe out any transformation style applied to a
> collection/image?
> Apparently removing the XMP file is not enough, I need to completely remove
> the collection? As specified here:
> http://www.darktable.org/usermanual/ch02s03s02.html.php#d0e2501

Removing the XMP does nothing from Darktable's point of view.
Darktable's "true" about an image history stack is in its internal
database, the XMP files are convenient to have for backup/migration
purposes but are not explicitly used (unless you tell Darktable to
check for changes on startup, and only then).

The right way to remove all transformations is the "discard" option in
lighttable's history stack module. However, this re-applies the
default style you mentioned.

If you really really want to start from zero an option would be to:
- enter an image in darkroom
- select "0-original" in the history module
- compress the history stack
- go back to lighttable and copy its history stack
- paste it on all pictures with the mode defined as "overwrite"
However, as per the manual
(http://www.darktable.org/usermanual/ch02s03s07.html.php), in order
for this to really result in an empty history stack you need to enter
each picture in darkroom before, which makes it a bit impractical.

Side-question to the developers: is there a way to apply a style in
"overwrite mode"?

Best regards,
Guillermo
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