This is the expected effect of basecurve with an image that is close
to saturation. All or almost all base curves increase image contrast
and thus lift the highlights; if the unaltered highlights are close to
clipping, the base curve will push them over into it.
My approach to dealing with this (in older darktable versions) varies
from case to case. Sometimes the highlights & shadows module will bring
things back, sometimes selectively or generally reducing exposure will,
and sometimes I need to turn off or alter the base curve module and then
recover (some of) the contrast it normally adds with other mechanisms.
I believe that the current version of darktable also adds an exposure
fusion mode that may help to recover highlights here.
(There are situations where white balance can also push highlights into
clipping in some colour channels, but these are harder to deal with
since an image with white balance color channel multipliers of 1.0 / 1.0
/ 1.0 is extremely off.)
By the way, all bets are off for areas that are clipped in the RAW in
one or more colour channels. Those have irretrievably lost some detail
(or all detail if all channels have clipped) and any detail or colour
has to be reconstructed using heuristics.
- cks
> Well---- blurs as in adds color which... Heck... I'll show you:
> https://drive.google.com/drive/folders/0B2xvsVTZy4y1ODR6dTk5UldpR3c?usp=sharing
>
> I figured it out how I should have stated it. The picture (which is blown
> out a little to start) is blown out and then blown out even more.
>
> On Mon, Feb 27, 2017 at 6:15 AM, Tobias Ellinghaus <m...@houz.org> wrote:
>
> > Am Sonntag, 26. Februar 2017, 18:00:18 CET schrieb Michael:
> >
> > [...]
> >
> > > 3- basecurve (that blurs details)
> >
> > As others pointed out, basecurve can't blur anything.
> >
> > > 4- color balance (blurs even more)
> >
> > Neither can color balance blur things. However, it's not a module that gets
> > applied by default. Please check the presets tab in the preferences and
> > see if
> > you yourself added an auto-apply preset for it. You can delete it if that's
> > the case to get rid of it.
> >
> > [...]
> >
> > Tobias
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