this works really well, too. i wonder if we should collect all those cool
tricks in a blog post. i prefer `global tonemapping' because it blends in
more nicely into the non-reconstructed parts.
for clipped regions i still used the reconstruction mode of the highlights
module (to get white details which tonemapping will bring down).
or alternatively i switched off the highlights module and used conditional
blending to grep for magenta in tonemapping/channel mixer/monochrome.
ultimately i guess it's worth designing a convenience module combining the
best of those techniques and providing easier access. should be easy to
create those blend mask automatically from the input values.
cheers,
jo
On Sun, Jun 9, 2013 at 8:47 AM, Markus Jung <maju.j...@web.de> wrote:
> 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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