The Durability of Computer To Plate.

The printing and wear characteristics of a positive working silver halide direct-digital (CTP) printing plate are analyzed to show that the method of imaging affects image durability on press. It is shown that halftone dots produced by a laser in a platesetter change in size more that halftone dots produced by film contact in a platemaker. A comparison between dot loss on the press sheets as well as on the printing plate is included. It is found that dot loss in terms of area is nearly independent of dot size. Both conventional and frequency modulation halftones are investigated.