Sentence:  If you have mastered the art of spot printing and dodging, you are ready for something really advanced, a post-graduate course in <WSD>montage</WSD>. As a matter of fact, <WSD>montage</WSD> used to be called "dodging" by most photographers, and "multiple printing" by the fussy few. 
Meaning of the word marked with <WSD> tags:  A composite work, "particularly" an artwork, created by assembling or putting together other elements such as pieces of music, pictures, texts, videos, etc. (from early 20th c.)