David Hockney used a technique called photomerge where he would take multiple close-up photographs of a subject and collage them together to create a single large composite image. Frank Luna used scanography, a non-traditional technique that involves scanning images on a scanner to achieve interesting effects due to the scanner's low depth of field. Jerry Uelsmann is known for his double exposures, a traditional technique where two different images are combined into one, usually contrasting each other.