| 摘要 |
A method and apparatus for producing vignettes includes the use of a rotary printing member having an outer surface with a series of elongated printing dots. The lengthwise dimension of the dots extends substantially in the machine direction of the printing press, i.e., in a direction perpendicular to the axis of rotation of the printing member. For producing vignettes, the dots increase in density in a direction parallel to the linear direction and have a width which is substantially less than the length. For process printing operations, each color of the process printing is laid down by a series of dots extending substantially in the machine direction, although the screen angles of each series of dots may vary. |
