27.12.2016, 20:46, johannes hanika kirjoitti:
hi,
sorry i don't have an english explanation, only the formulas.
this module enhances local contrast by using
``Unnormalized bilateral filtering''
as described in
http://people.csail.mit.edu/hasinoff/pubs/AubryEtAl14-lapfilters.pdf
(the rest of the paper is implemented in a branch).
Are you sure that paper isn't about the wave functions of quantum
mechanics? ;-)
the detail slider is mapped to the amount the difference to the base
image will be multiplied by.
Difference caused by what? Multiplied by what? Sorry, I'm sure it's
just me, but I don't even know what refers to what in the above sentence.
the backend uses the bilateral grid.
Suddenly the veil was lifted and everything became crystal clear...
Thanks for trying. I'll just push the sliders around and try to come up
with something that looks good :-)
-Ari-
On Wed, Dec 28, 2016 at 6:21 AM, Ari Torhamo <[email protected]> wrote:
Hello,
I've been trying to find out what the different sliders on the local
contrast tool actually do in Darktable. There are three sliders and the
working of the first one seems obvious; it adjusts the radius (in pixels?)
of the area the other sliders affect on.
The contrast slider doesn't seem to do anything if the detail slider is in
zero position. In other positions both sliders change contrast, although
differently, the detail slider having a stronger effect. I'd like to know
what these two sliders actually do. I've been testing and observing their
working on different photos, but I still feel that there's too much trial,
error and confusion involved in using them.
I'm not asking for mathematical formulas (although they might be
interesting, if I'd understand them), but rather a clear explanation in
plain English. The explanation on the Darktable user manual is very vague,
and a good amount of googling didn't help either.
I hope someone in the know can take the time to answer this. Perhaps the
answer could be used to improve the user guide. Thanks in advance!
Ari Torhamo
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