>
> 2) Color reconstruction of blown-out highlights works very well.
> The second aspect is certainly something we need to work on. RT has a
> method called "color propagation" which seems to work better than our
> "color reconstruction" (which already has been a big step forward).
> I am not sure if we can get much better within the current "highlight
> recovery" module - maybe this is job for a separate module that works on
> demosaiced data.
I have wanted to look into RT's highlight reconstruction algos for quite
some time now,
but there was always something more urgent (and with less dirty "reference
implementation", if any) things on which I had to work on.
Maybe i will be able to find some time to work on that in this cycle...
Ulrich
Roman.
On Sun, Feb 22, 2015 at 10:14 PM, Ulrich Pegelow <
[email protected]> wrote:
> Hi,
>
> yes, I also can confirm that RT really excels in highlight
> reconstruction and is ahead of darktable (*). IMHO this has two aspects:
>
> 1) RT controls all this from one single panel. So there are only few
> clicks needed to get to the desired result.
>
> 2) Color reconstruction of blown-out highlights works very well.
>
> I think the first aspect is a question of UI philosophy. Highlight
> reconstruction involves different steps (dealing with clipped channels
> in pre-demosaic, negative exposure correction, color reconstruction)
> which in the case of darktable involves different modules. I think there
> are good arguments for our way of working.
>
> The second aspect is certainly something we need to work on. RT has a
> method called "color propagation" which seems to work better than our
> "color reconstruction" (which already has been a big step forward).
>
> I am not sure if we can get much better within the current "highlight
> recovery" module - maybe this is job for a separate module that works on
> demosaiced data.
>
> Ulrich
>
> (*) Driven by the example image provided by Istvan I have worked a bit
> on the shadows&highlights module. You can find my work in PR 866. This
> further helps in correcting blown out highlights but still lacks a
> convincing color recovery.
>
> Am 22.02.2015 um 19:28 schrieb Markus Jung:
> > Am 22.02.2015 um 19:18 schrieb KOVÁCS István:
> >> I've tried dcraw -E (just dump the raw pixels without
> >> demosaicing/highlight recovery etc.), then used a 2x2 convolution
> >> matrix in the Gimp to join the 2x2 R-G-B-R blocks into a single pixel.
> >> The result is at
> >> http://tech.kovacs-telekes.org/files/DSC_4684/DSC_4684-dcraw_-E.jpg -
> >> lots of highlight details are available, but I have been unable to get
> >> usable highlights from either darktable, digikam, dcraw (used -b 0.5
> >> to reduce exposure by 1EV, and tried all highlight recovery modes of
> >> dcraw).
> >>
> >> Anyone?
> >
> > I tried to recover them with darktable, too. The best results have been
> > archived by using the new highlight recovery mode "reconstruct color"
> > but RawTherapee did a noticeable better job.
> > I guess darktable lacks some more enhanced highlight recovery algorithm.
> > Maybe one of the devs will notice your example and has some more ideas.
> >
> > Regards,
> > Markus
> >
>
>
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