The methods for combining pictures are also called photomontage.
Photomontage is the process and result of making a composite photograph by cutting and joining a number of other photographs. The composite picture was sometimes photographed so that the final image is converted back into a seamless photographic print. A similar method, although one that does not use film, is realized today through image-editing software. This latter technique is referred to by professionals as "compositing", and in casual usage is often called "photoshopping"
The 19th century tradition of physically joining multiple images into a composite and photographing the results prevailed in press photography and offset lithography until the widespread use of digital image editing. Contemporary photo editors in magazines now create "paste-ups” digitally. Creating a photomontage has, for the most part, become easier with the advent of computer software such as Adobe Photoshop . These programs make the changes digitally, allowing for faster workflow and more precise results. They also mitigate mistakes by allowing the artist to "undo" errors. Yet some artists are pushing the boundaries of digital image editing to create extremely time-intensive compositions that rival the demands of the traditional arts. The current trend is to create pictures that combine painting, theatre, illustration and graphics in a seamless photographic whole.