Offset printing method and high-density mini-prints produced by the method

摘要

An offset printing method, comprises a film preparing step of generating four color components of cyan, magenta, yellow, and black by separation of an original with an electronic camera processor and subjecting the components to dot process of a dot generator to form their respective dot positive films; a plate making step of transferring dot patterns of the dot positive films to four PS plates respectively; and a printing step of printing the dot patterns of the PS plates onto a given sheet of paper. The dot positive films produced at the film preparing step are arranged to have a more than 300-line resolution. A dampening liquid used at the printing step has a pH of 4 to 7 and a surface tension of 40 to 45 dyne/cm.