Значения термина composite portrait на английском

Composite portraiture (also known as composite photographs) is a technique invented by Sir Francis Galton in the 1880s after a suggestion by Herbert Spencer for registering photographs of human faces on the two eyes to create an "average" photograph of all those in the photographed group.Spencer had suggested using onion paper and line drawings, but Galton devised a technique for multiple exposures on the same photographic plate.