A method for producing a half-tone image faithfully representing a continuous-tone 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 continous-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 application is a continuation of Ser. No. 08/184,175 filed Jan. 21, 1994, now U.S. Pat. No. 5,793,500 issued Aug. 11, 1998, which in turn is a continuation of Ser. No, 07/981,891 filed Nov. 23, 1992, now U.S. Pat. No. 5,283,140 issued Feb. 1, 1994, which in turn is a continuation of Ser. No. 07,553,425 filed Jul. 17, 1990 (abandoned), and claims priority benefit to application Ser. No. 91054 filed Jul. 20, 1989 in Israel.
Each halftone dot is randomly placed, and the halftone dot area rate at which half of the halftone dots join with their adjacent halftone dots in an image area having a uniform image density is set to a value larger than 50%. When each halftone dot joins with its adjacent halftone dots, a plurality of joining points at which the halftone dot joins with-its adjacent halftone dots do not simultaneously start to join with the adjacent halftone dots.
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.
