A method for producing a half-tone image faithfully representing a continuous-tne original includes a step of forming in the image a pattern of substantially continuous, substantially parallel lines at a frequency of between about 100 and 400 lines per inch, such that the width of the lines at a given point in the image varies in relation to the optical density of at least one color component at a corresponding point in the continuous-tone original. The method may be used for color separations with each separation produced by scanning at a different angle. The method may be implemented using photomechanical or electronic scanning techniques.
This is a continuation of U.S. patent application Ser. No. 09/026,655 filed Feb. 20, 1998 now U.S. Pat. No. 6,163,382, which is a continuation of U.S. patent application Ser. No 08/184,175 filed Jan. 21, 1994, now U.S. Pat. No. 5,793,500, which is a continuation of U.S. patent application Ser. No. 07/981,891, filed Nov. 23, 1992, now U.S. Pat. No. 5,283,140, which is a continuation of U.S. patent application Ser. No. 07/553,425, filed Jul. 17, 1990, now abandoned, which claims priority of Israel Application No. 91054, filed Jul. 20, 1989.
