photomechanical
adjective
pho·to·me·chan·i·cal ˌfō-tō-mi-ˈka-ni-kəl 
: relating to or involving any of various processes for producing printed matter from a photographically prepared surface
photomechanically
ˌfō-tō-mi-ˈka-ni-k(ə-)lē
adverb 
Example Sentences
Recent Examples on the Web Your print may indeed be a steel engraving, or perhaps a collotype, which is produced by a photomechanical process. 
oregonlive, 1 Sep. 2020 The fakes, on the other hand, are typically photomechanical reproductions of the originals. New York Times, 24 Jan. 2020
oregonlive, 1 Sep. 2020 The fakes, on the other hand, are typically photomechanical reproductions of the originals. New York Times, 24 Jan. 2020 Word History
Etymology
International Scientific Vocabulary
First Known Use
1870, in the meaning defined above