I regularly take photos on a fixed background under natural light.
I use a grey-card for white balance which works well enough. I take a test shot with the card, white balance it and save that as a preset which I use for the white balance of all images in that session.
However, I'm struggling to have consistent brightness to the final image, especially for images taken during different sessions.
I would like to be able to take a spot (or small area) from the background and be able to tell Darktable to set that area to a certain exposure value.
Does anyone know if that's possible?