I have been seeing a few photos lately were the photographer says he uses one exposure for the background and a different one for the foreground.
I assume he has a tripod and takes two photos. Let's say 20sec and another photo at 1sec.
How do they separate and splice together these two photos so perfectly. Is is time intensive manual work in Photoshop or can you autmate this in Photoshop. Any tutorials out there?
Look at this sample for instance: