intaglio vs rotogravure

intaglio

noun
  • Any printing method in which the ink is laid upon the sunken parts of the printing form. 

  • A design or piece of art which is engraved or etched into something. 

verb
  • To engrave or etch using intaglio. 

rotogravure

noun
  • A printing process by which the paper is rolled through intaglio cylinders. 

  • A print made by such a method. 

  • A portion of a printed work produced by this method. 

How often have the words intaglio and rotogravure occurred in a corpus of books? (source: Google Ngram Viewer )