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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