Noun
printing in (uncountable)
(photography) A process by which cloud effects or other features not in the original negative are introduced into a photograph. Portions, such as the sky, are covered while printing and the blank space thus reserved is filled in by printing from another negative.
The discovery of printing in the middle of the fifteenth century implied the beginning of a return to a type of civilization dominated by the eye rather than the ear. Harold Innis
So far as the mere imparting of information is concerned, no university has had any justification for existence since the popularization of printing in the fifteenth century. Alfred North Whitehead