Is it possible to somehow apply white balance from image area to a bunch of files?
I’ve shot indoor timelapse for about 12 hours with fixed WB, but for some period of time artificial light was turned on, so in result some photos are to warm, others a bit cold. I can’t find any way to set auto WB for all images (with copy/paste history it’s possible to only apply particular temperature settings)
To copy it from an image to other, just select first image to copy and then press shift+ctrl+c and then select modules, so white balance one, you want to apply. Then paste this to other images (you could also press Shift+ctrl+v to select modules when you paste). Be sure to have good option (overwrite or append mode in history stack module in lighttable view.
For changing light, the only good way to do this is to have a neutral patch in the scene from which you can set the white balance per-image. I would not rely on using “as-shot” white balance from a camera’s auto mode, unless you first tested such with identical light dynamics.
Darktable does have a patch mode for white balance, I’m not a dt user, so asking: can a dt patch wb style be applied en-masse to a set of images?
No, unfortunately when you copy the WB module you transfer the coefficients, not the auto mode.
@ShiAiLang: you can try with dtlapse. It’s a script that allows you to interpolate WB (and other modules) between shots. If you have few changes it should be faster than define the white balance manually for each image.
Modern workflow should work…WB is d65 for all and cc module could certainly be copied after the auto picker was invoked if that was the intention unless you meant auto picker run on the same area for each image automatically?? @ggbutcher ?? Then not doable I don’t think. The good thing is if you define an area in one image it stays there image to image so you could just advance images with the cc module open and keep clicking the picker…bit tedious but doable for a small stack
With rawproc white balance and a few other tools, I struggled to figure out what I wanted to go into the clipboard. With white balance, the patch coordinates or the multipliers they generated? I finally settled on the latter, but this conversation has me rethinking it.
With the batch command, however, one can still specify patch coordinates as the white balance tool’s mode, so it would support the timelapse use case.
Thanks a lot for all replies. I have already processed this pack manually clicking WB from image area for each shot (doable but not fun with pack of 750 shots 
)
Next time I’ll check modern workflow and dtlapse