This means that two or more shots are captured in one image. In analogue photography, film transport is prevented so that two or more photos are exposed on one negative.
In digital photography, some cameras have a multiple exposure function that allows two or more shots to be combined into one image. The data from all exposures is saved in one file. In addition - with my camera - the blending method can be selected:
- Additive (images are superimposed)
- Average (as additive with automatic exposure compensation)
- Bright (exposure priority of the bright image areas)
- Dark (exposure priority of the dark image areas)
Two examples of double exposures using different blending methods
