If someone could synthesize this collective wisdom, this thread could
become a great blog post...


On Sun, Jun 9, 2013 at 11:49 PM, Markus Jung <maju.j...@web.de> wrote:

> Play a bit around with the threshold parameter of the
> highlight-reconstruction module.
> I just have observed some nice results using LCh recovery and threshold
> of 0.9, the colors have been a bit wrong (green/magenta instead of
> blue/white), but i was able to fix this with color correction and
> blendif, too. And the sky has been blown out nearly hopelessly ...
>
> The tonemapping-trick recovers only highlights you have blown during
> processing, highlights which are blown out in RAW can not be recovered
> this way.
>
> Regards,
> Markus
>
> Am 09.06.2013 23:31, schrieb Roumano:
> > Hi,
> >
> > I have tested it, yes i can recover details on highlihts but get some
> > magenta area instend of white... (tested on a test image heavy over
> > exposed)
> >
> > The best way to remove them after is to use to channel mixer with
> > blendif H, input, magnenta color ?
> >
> > Or i doing something wrong & you can share a style for exemple ?
> >
> > Regards
> >
> >
> > Le samedi 08 juin 2013 à 23:02 +0200, Markus Jung a écrit :
> >> Sorry, one misstake: 0-140, not 140-255 ;)
> >>
> >> Am 08.06.2013 22:47, schrieb Markus Jung:
> >>> I have just found something which works quite fine for me, even if the
> >>> sky is fully blown out during processing:
> >>>
> >>> - Process for the dark regions of your image
> >>> - Activate the module "tonemapping"
> >>> - Set contrast compression to 1,0 and use blendif to limit the effect
> of
> >>> the module to the bright parts of the image (for example 140-255)
> >>> - Use mask blur (for example 2.5) to prevent halos and other ugly
> effects.
> >>>
> >>> Regards,
> >>> Markus
> >>>
> >>> Am 28.05.2013 23:42, schrieb Chris Siebenmann:
> >>>>  A number of darktable processing steps can push unclipped RAW
> channels
> >>>> into overexposure under some circumstances (for example, the standard
> >>>> Nikon base curve not infrequently blows highlights out on me). As a
> >>>> relative beginner at darktable, I'm interested in people's views on
> the
> >>>> best and easiest way to recover the highlights in this case.
> >>>>
> >>>>  I think that what I want at a conceptual level is to pull the
> >>>> highlights down (I assume inevitably reducing highlight contrast),
> >>>> but there may be something that gives a better visual look. Things
> >>>> I've tried, without universal success:
> >>>>
> >>>> * the Shadows and Highlights module often doesn't really reduce the
> >>>>   blown highlights very much (or at all) and can give me an unnatural
> look
> >>>>   (this may mean that I need to change the 'soften with' setting).
> >>>>
> >>>> * the Zone module also doesn't seem to be able to pull down the
> >>>>   brightness of the blown highlights, although it can be used on
> things
> >>>>   that aren't too bright.
> >>>>
> >>>> * Tone curves have defeated my ability to make good fine adjustments
> at
> >>>>   the bright end of the curve without screwing up the rest of the
> image.
> >>>>   I assume it's possible but I'm clearly not doing something right.
> >>>>   (I've tried setting the linear preset to freeze most of the 'curve'
> >>>>   and then monkey around only with the top end.)
> >>>>
> >>>>   (I suspect that this is the right solution and what I want to do is
> >>>>   develop some sort of 'highlight recovery' preset, but it's beyond my
> >>>>   current darktable skill.)
> >>>>
> >>>> * the Levels module won't let me move the white point out to the right
> >>>>   (which I think might have roughly the effect I want but I could be
> >>>>   wrong about).
> >>>>
> >>>> Since I suspect that this sort of question always works better with an
> >>>> example, here's a sample D7100 NEF that exhibits the sort of 'blown in
> >>>> processing' effect that I'm talking about:
> >>>>
> >>>>    http://www.cs.toronto.edu/~cks/tmp/darktable/DSC_1101.NEF
> >>>>
> >>>> (This picture has some genuinely clipped areas, but only a small
> >>>> number; many more blow out with the default Nikon tone curve.)
> >>>>
> >>>> (Note that I'm presenting this for illustrative purposes; I'm less
> >>>> interested in how to process this specific picture than in how to
> >>>> recover highlights in the general case that this picture is an example
> >>>> of.)
> >>>>
> >>>>  Thanks in advance to anyone who has suggestions, guidance, etc.
> >>>>
> >>>>    - cks
> >>>>
> >>>>
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> >>>
> >>>
> >>>
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> >>
> >>
> >>
> >
> >
> >
>
>
>
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