Analog Efex Pro’s double exposure tool is one of the features that makes this program unique. Here’s a breakdown of how its Double Exposure presets work and how they combine double exposures with other effects.
Multiple exposure
Taking two shots on a single frame. In the days of film this meant locking the film advance when cocking the shutter and taking another picture on a frame of film that’s already been exposed. On a digital camera, the camera stores the first image in its memory and then merges it with the second.