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SCREENING PROCESS SIMULATION APPARATUS

  • US 3,629,493 A
  • Filed: 11/06/1969
  • Issued: 12/21/1971
  • Est. Priority Date: 11/06/1969
  • Status: Expired due to Term
First Claim
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1. Apparatus for independently and electronically simulating the graphic arts process step of screening a continuous tone image to develop a corresponding halftone image, comprising:

  • signal translation means, consisting of a single signal translating channel having a predetermined nonlinear input signal amplitude to output signal amplitude translation characteristic different portions of which are proportiOnal to the continuous-tone to halftone conversion that occurs in corresponding different screening processes to be simulated, for translating a supplied signal over a portion of said characteristic determined by the range of amplitude variations of the supplied signal;

    adjustable input signal modifying means, responsive to an input signal having amplitude variations within a first range of values and representative of a continuous tone image, for adjustably modifying said input signal to develop a modified signal having amplitude variations proportional to those of said input signal but extending over a selected second range of values corresponding to the portion of said nonlinear signal translation characteristic that represents a selected one of said different screening processes and for supplying said modified signal to the signal translating channel of said signal translation means; and

    adjustable translated signal modifying means, coupled to the output of the signal translating channel of said signal translation means, for modifying said translated signal to develop a resultant signal having amplitude variations proportional to those of said translated signal and extending over a selected third range of values and representative of a desired halftone image which can be developed from said continuous tone image by means of said selected screening process.

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