wow, this looks interesting and useful!


On Wed, Mar 22, 2017 at 11:55 PM, Heiko Bauke <> wrote:
> Hi,
> in Darktable masks can be blurred by a Gaussian filter.  I have implemented
> an experimental feature to modify parametric and drawn masks by another kind
> of filter called guided filter.  Such a guided filter blurs the mask but
> also takes into account the structure of the image. It is guided by the
> image.  When a drawn or parametric mask is filtered by the guided filter it
> tends to have edges where also the image has edges.  The guided filter is
> similar to a bilateral filter but is less prone to cause halo effects at
> edges.  The effect of the guided filter is also illustrated in the attached
> figures.  The theory behind this filter is described in
> If you want to play with this new feature checkout the guided_filter branch
> in my darktable repository on github.  Feedback will be welcome.
> Warning: Make sure that the modified version of darktable does not overwrite
> your working data base, e.g. use the --configdir option. Otherwise you may
> experience problems when going back to Darktable 2.2.3.
>         Heiko
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