Abstract: A novel printing plate mounting device and procedure are provided. A small-scale single-color representation of a carton blank or other substrate and a complete usually multi-color image to be printed thereon is projected from an acetate film or other suitable substrate onto a carrier sheet to provide a full-scale single-color representation of the substrate and the image to be printed thereon. A small-scale usually multi-color representation of the carton blank and the complete usually multi-color image to be printed thereon is used as a template to determine which ones of a plurality of individual printing plate elements is used to print which ones of the color of the multi-color image. The individual printing plate elements for each color then are affixed to separate carrier sheets in the position shown by the full-scale single-color representation.