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). the detail slider is mapped to the amount the difference to the base image will be multiplied by. the other two are the range sigma (contrast slider, colour distance, L channel only in this implementation) and the spatial sigma (radius, pixel distance). the backend uses the bilateral grid. cheers, jo On Wed, Dec 28, 2016 at 6:21 AM, Ari Torhamo <ari.torh...@gmail.com> 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 > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
