In the development version of darktable shadows&highlights has got an additional parameter "white point adjustment". This parameter moves the white point by a given number of L-units. So by doing a negative correction you might be able to reach the desired effect.
Ulrich Am 06.06.2015 um 06:01 schrieb Chris Siebenmann: > I've been using darktable for a few years now and processed a decent > number of photos with it. Over all of that time, the single most > difficult and troublesome thing for me to deal with in darktable is > trying to recover artificially burned out highlights. > > (By 'artificially burned out' I mean highlights that are not burned out > in the RAW before the base curve and white balance are applied.) > > The obvious way to go is the highlights recovery setting on the shadows > and highlights module. Unfortunately in practice this does little or > nothing to the high end of highlights; they stay burned out even if you > crank the highlights well down into unnatural territory. None of the > other modules I've tried do a particularly good or easy job of this > either. > > It's my view that this situation is kind of absurd. Artificially blown > highlights are quite common and it seems crazy that darktable cannot > easily handle them, and especially that it cannot handle them in the most > natural module for the task. If there is something unusually complicated > about handling them in 'shadows & highlights' (which does come quite > late in the module processing list), I'd suggest that darktable add a > dedicated highlights recovery module at whatever point in the processing > pipeline makes the most sense and/or makes it easiest internally. > > As for modules I've tried: > > The graduated density module? Sort of useful when I have eg burned out > sky, but again it seems to do remarkably little to burned out highlights, > far less than I would expect based on its nominal EV. In fact its nominal > EV seems rather inconsistent; I have sometimes used +EV in the exposure > module followed by the same -EV in graduated density and observed that > the resulting grad'd area does not have the same exposure as before > both modules. > > In theory I should be able to fiddle with the applied base curve to > tame the high end. In practice the interface of the base curve makes > it extremely difficult to do this, because all of the highlights are > crammed in at the top left and need extremely fine manipulation to get > natural results that recover highlights. Turning off the entire base > curve 'curse' highlights at the expense of everything else, which is > not really an easy way to go. > > (I've advocated for better base curve control before, but yeah, here it > is again. The 'logarithmic' display is not really it, although it's a > bit of an improvement over the linear display.) > > The tone curve suffers from the same precision issue and at least > some of the time it seems to have the same problem of not really touching > the burned out areas. It also requires a deft hand to only touch the > highlights (or you get to go try to make it play well with parametric > action restrictions). > > The zone system module seems to have real problems getting to *just* > the burned out highlights or even close to them in the highlights; > I have to turn the number of zones up to the max to even get close to > 'just the burned out area or really close'. And then it's once again > awkward to select and act on just the highlights. > > - cks > ------------------------------------------------------------------------------ _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
