Hi Bernhard,
sorry for the late reply, I've been on vacation.
I looked briefly at the resources you provided, but I think they don't
solve the problem of flickering white balance / color temperature.
However, in the mean time I cloned darktable's source code repository
and skimmed through the code. I more or less understand how modules
work and I think (?) that the color picker needs mouse focus to work,
which is why it cannot work in the background. I wonder if it's
possible to get the color information for all pixels in the image and
calculate an intermediate color temperature, maybe using a bias value.
If someone can help me on
1) how to get all the necessary color information (e.g. using the
color picker module without GUI interaction(?))
2) the algorithm on how to calculate the color temperature using a bias value
then I think I might be able to write a module for auto white balance.
Btw. Rawtherapee has an AWB mode which works exactly the way described above. :)
Cheers,
Jochen
On Wed, Aug 1, 2018 at 7:21 PM Bernhard wrote:
>
> I remembered there was something that reminded me at lrtimelaps - but using
> darktable - in the past.
> A quick search showed this up:
> https://discuss.pixls.us/t/how-do-you-create-a-time-lapse-on-darktable/8094/14
> is the newer approach
> https://www.youtube.com/watch?v=C-0bCAIJR0c is the older one.
> Perhaps this might give useful hints (?).
>
> --
>
> regards
> Bernhard
>
> https://www.bilddateien.de
>
>
> Jochen Keil schrieb am 01.08.2018 um 15:05:
>
> Hi,
>
> On Wed, Aug 1, 2018 at 1:31 PM, wrote:
>
> Jochen Keil (2018-Aug-01, excerpt):
>
> Is there a way to tell darktable that it should analyze each image on its
> own using the selected spot area for white balance?
>
> I doubt it. I've been asking for the same thing with respect to
> exposure correction (metering a certain region on all images for
> neutral gray). While “exposure” has an automatic mode (which totally
> did not work for me), there's no such thing in “white balance”.
>
> Implementing this would require darktable to offer two choices when
> copying a setting to another image: Do you want to copy *how* the
> change was determined and apply the result (your use case), or copy
> the change itself (e.g., copy white balance form one photo of a white
> reference to all photos from the same shoot)? It would be nice to
> have this, but it's probably quite nasty to implement in the
> details...
>
> that's sad to hear. I'd have figured that it might be easy to implement,
> but then I don't know anything about the inner workings of darktable.
>
> Well then, I can only hope that this feature makes it to one of the future
> versions of darktable.
>
> Any suggestions on alternatives or how to fix this?
>
> Thank you,
>
> Jochen
>
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