If the goal is just to blur, then the low-pass filter is more adapted than 
"soften" (which does a combination of blur+overexpose with the original image).

Be careful, though, with the combination of a bluring module and mask: a strong 
blur with 50% opacity is not the same as a less strong blur: you get the 
superposition of the sharp image with the blured one. I don't think darktable 
has a good way to get a blur gradient.

Cheers,

----- Original Message -----
> Try the "soften" module in the effects group:
> https://www.darktable.org/usermanual/ch03s04s05.html.php
> 
> On Fri, Apr 1, 2016 at 3:06 PM, <[email protected]> wrote:
> 
> > On Fri, 1 Apr 2016 21:03:04 +0200
> > Romano Giannetti <[email protected]> wrote:
> >
> > >I don't think it's just processing. I think she used a quite fast
> > >lens, wide open, to start with; the bokeh effect is very difficult
> > >to reproduce if you don't have it in the original photo
> > >(impossible?). It seems to me that she has a bit of swirly bokeh
> > >too, "Petzval" style...
> > >
> > http://photo.stackexchange.com/questions/65143/what-swirly-bokeh-technique-is-this-and-how-can-i-achieve-it
> > >
> > >
> > >Then the rest seems to be a bit of vignetting and blur with a
> > >circular mask...
> > >
> >
> > She uses a Canon 70-200L f/2.8 at between f/5.6 to f/8. It's because
> > of the DOF to get the dogs' faces (from nose to ear) in focus. The
> > capture distances seem to be between 2.5m/8ft to 5m/15ft (from my
> > experience with dogs and the Canon 70-200)
> >
> > I knew about the vignetting, but not about the blur with circular
> > mask. Is there something equivalent in DT?
> >
> > Thanks
> >
> > --
> > sknahT
> >
> > vyS
> >
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> >
> >
> 
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-- 
Matthieu Moy
http://www-verimag.imag.fr/~moy/
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