Ok, I played around with all of this for a while, and I got the best result
by lowering the clipping threshold in the Highlight Reconstruction module
to 0.830, reducing Exposure a bit depending on the image and also lowering
the top of the Base Curve a bit and created a style with these new
settings. This is not perfect, though, as the clipping point will be some
distance below 100%, but at least I recover maximum detail this way.
I also tried to play around with the white point value in the cameras.xml
file, but I was not able to find a better value than the default one.
Lowering the value gave more clipping and raising it gave purple color that
I could not get rid of.
Thank you all for your efforts so far! And I hope the experts will look
into this in more depth so it will be perfect in the next release, even
with a clipping threshold of 1.0 :-)
Hans Petter
2013/2/22 Julian J. M. <[email protected]>
> You are correct... I just checked and it reconstructed the highlights
> correctly. WIth LCh reconstruction.
>
> I said it just clipped because at 0.837 or higher, I just see a solid gray
> area... compatible with what I thought was clipping.
> But if I set it to 0.836 or lower, I instantly see the bright clouds. It's
> not progressive.
>
> Julian.
>
>
> On Fri, Feb 22, 2013 at 5:33 AM, johannes hanika <[email protected]>wrote:
>
>> the whitepoint in cameras.xml for this camera is overly conservative
>> and should be lowered quite a bit. if i set it manually to 0.796 in
>> the highlight reconstruction module, i get:
>>
>> http://picpaste.com/img_0001-9Nd40hrz.jpg
>> http://picpaste.com/img_0002-hqTB2bvP.jpg
>>
>> (full processing details in the xmp in the jpg)
>>
>> j.
>>
>> On Fri, Feb 22, 2013 at 2:06 PM, Henrik Andersson <[email protected]>
>> wrote:
>> > 2013/2/22 johannes hanika <[email protected]>:
>> >> On Fri, Feb 22, 2013 at 1:22 PM, Julian J. M. <[email protected]>
>> wrote:
>> >>> Hightlight reconstruction in darktable seems to just clip the values,
>> >>
>> >> not true.
>> >>
>> >
>> > is it broken ? feels like it... playing with the TO's raw file.
>> >
>> >>> 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
>> >>>> >>
>> >>>> >>
>> >>>> >>
>> >>>> >>
>> ------------------------------------------------------------------------------
>> >>>> >> Everyone hates slow websites. So do we.
>> >>>> >> Make your web apps faster with AppDynamics
>> >>>> >> Download AppDynamics Lite for free today:
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>> >>>> >>
>> >>>> >>
>> >>>> >>
>> >>>> >> _______________________________________________
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>> >>>> >>
>> >>>> >
>> >>>> >
>> >>>> >
>> ------------------------------------------------------------------------------
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>> >>>> > Make your web apps faster with AppDynamics
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>> >>>>
>> >>>>
>> >>>>
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>> >>>
>> >>>
>> >>>
>> >>>
>> >>> --
>> >>> http://www.julianmenendez.es
>> >>
>> >>
>> ------------------------------------------------------------------------------
>> >> Everyone hates slow websites. So do we.
>> >> Make your web apps faster with AppDynamics
>> >> Download AppDynamics Lite for free today:
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>
>
>
> --
> http://www.julianmenendez.es
>
>
> ------------------------------------------------------------------------------
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