Aha, I actually found a place where this thing is reported, discussed and
apparently fixed - https://github.com/darktable-org/darktable/issues/3865 -
so I guess later builds/versions should fix the issue.
Cheers!
Isabelle

On Mon, Jan 27, 2020 at 10:24 AM Jochen Keil <[email protected]> wrote:

> Hi,
>
> I've also experienced this behaviour. It might or might not be related an
> error message I got from the local contrast module: "inconsistent output".
>
> Thanks for reporting!
>
> Cheers,
>
>   Jochen
>
>
> On Mon, Jan 27, 2020 at 10:02 AM Isabelle Hurbain-Palatin <
> [email protected]> wrote:
>
>> Ah, yes, I ran into that one as well. The "winning combo" for me is
>> "filmic rgb + color balance + local contrast + base curve (non rgb)" -
>> since the fact that filmic rgb and base curve were both on at the same time
>> was a mistake from my side (and not something I really wanted to do :P ) I
>> let it go when I ran into it. And, as far as I can tell, this is
>> reproducible on any image from my side (Pentax DNG). But now that I'm
>> testing a bit more, it seems indeed to fail with the rgb curve as well.
>> Anyway, long story short - I vaguely looked into redmine and it doesn't
>> seem to be reported yet - so I'll write it :)
>>
>> Cheers,
>>
>> On Mon, Jan 27, 2020 at 9:25 AM Moritz Schallaböck <
>> [email protected]> wrote:
>>
>>> > I get a strange behavior when using color balance on one of my photos.
>>> > When enabling the module the image and the preview image get
>>> > completely dark. When disabling the module everything is back to
>>> > normal. This happened so far only with one photo.
>>>
>>> I've also got this on a few pictures. It's very odd. At some point
>>> when I zoom in, the issue goes away. The thumbnail in the darktable is
>>> black, too.
>>>
>>> Disabling a module gets rid of the problem for me too. In the case of
>>> the image in the attached screenshots, disabling any of local
>>> contrast, filmic rgb, rgb curve, color look up table, crop and rotate
>>> and denoise (profiled) renders the image fine at 11% zoom. Disabling
>>> any of tone curve, tone equalizer, orientation, highlight
>>> reconstruction, white balance doesn't accomplish anything.
>>>
>>> I've taken it a subtle hint that I'm overediting. ;)
>>>
>>> Cheers
>>> Moritz
>>>
>>>
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>>
>>
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