Hightlight reconstruction in darktable seems to just clip the values, so
that the color turns white (or gray if you keep lowering it)... But it
looses much information that's there. Usually it's the green channel what
gets overexposed, but knowing the aproximated tone of the area, using the
red and blue channels, it should be possible to reconstruct much of the
missing information.
That's what Rawtherapee seems to have implemented:
http://code.google.com/p/rawtherapee/issues/detail?id=780
There's a patch there... not sure how hard would it be to port it to
darktable.
Julian.
On Thu, Feb 21, 2013 at 10:39 PM, johannes hanika <[email protected]> wrote:
> yes, what simon said. there are two things i would try, one is
> exposure, the other is adjust the basecurve to something a little
> lower in the bright regions at least (or try the `dark contrast' one
> and pull down the right end some more). you first need to get the
> highlights down < 1.0 before you can actually see the effect of
> reconstruction.
>
> -jo
>
> On Fri, Feb 22, 2013 at 11:36 AM, Simon Spannagel <[email protected]> wrote:
> > Hi Hans Petter,
> >
> > have you tried to adjust the exposure in darktable? To me it looks a bit
> > like the details should be there in general but the areas are still
> > overexposed since both dt pictures are much brighter in general.
> >
> > Simon
> >
> >
> > Am 21.02.2013 23:29, schrieb Hans Petter Birkeland:
> >> Hi,
> >> I'm testing out Darktable and Rawtherapee at the moment to see which one
> >> of them I will use in the future. I must say that Darktable wins in
> >> every respect but one: Highlight reconstruction. I find that Rawtherapee
> >> is capble of recovering much more detail from overexposed highlights.
> >>
> >> Here are some examples:
> >> https://www.dropbox.com/sh/s15m6zokz2ksugb/UGt6o64Lj9
> >>
> >> The method I used in Darktable was Reconstruct in LCh, and in
> >> Rawtherapee I used Color Propagation.
> >>
> >> Any idea why Darktable can't find what is actually there? The Color
> >> Propagation is quite slow on my ancient system, but the result is so
> >> much better. Any chance that Darktable will do this in the future?
> >>
> >>
> >> My system:
> >> Linux Mint 13, 32 bit
> >> Darktable 1.1.3
> >> Rawtherapee 3.0.0.6
> >>
> >>
> >> Thanks,
> >> Hans Petter Birkeland
> >>
> >>
> >>
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> >
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