Double-exposure photography is created by the merging of two images into one. Historically, this required special cameras and film development techniques. Modern digital cameras now have settings that allow for the capture of multiple exposures. Editing software like Photoshop also makes achieving this effect much simpler than film, although some purists would argue that it’s not a true double exposure if it’s not on film. Apps are now available to produce this effect on smartphones too.
The technique can be employed to deliver images with a surreal, ghostly quality to them. They often use silhouettes to create interesting, expressive imagery of two (or more) things at once. There is endless room for creativity in a double-exposure photo.
However, some planning of a double-exposure shot is required to determine a composition that will work well. A base photo must be captured, then the layer photo(s), and then the two images need to be edited and merged into one. The background of the base photo needs to be removed before adding in the layer(s) and blending them together for the final result.