I'm loving Darktable so far, but it's in my nature to try to determine the limits of a program like this, and the one thing I haven't figured out yet is how to use more than one photo in conjunction.
I'm guessing that if I want to do things like double-exposed images, or merging more than one image in any kind of way, I'll need to use something like Gimp that uses layers. Still, I saw that there is an HDR module, so Darktable does at least have the capacity to merge multiple images.
Can it be done? Can Darktable do double exposure?