[54] APPARATUS FOR SIMULATING COLOR PRINTING PROCESS
[75] Inventors: Satoru Horiguchi, Saitama; Takeshi Sasaoka, Kawasaki; Koichi Shimane, Kawasaki; Shigeru Mogi, Kawasaki; Tsuguo Yaguchi, Kawasaki; Kazuhiko Sano, Kawasaki, all of Japan
[73] Assignees: Dai Nippon Printing Co., Ltd.;
Ikegami Tsushinki Co., Ltd., both of
Tokyo, Japan
[21] Appl. No.: 264,421
[22] Filed: May 18, 1981
[30] Foreign Application Priority Data
May 20, 1980 [JP] Japan 55-65933
[51] Int. C1.3 G03F 3/00; H04N 9/535
[52] U.S. CI 358/76; 358/80
[58] Field of Search 358/75, 77, 80, 76
[56] References Cited
U.S. PATENT DOCUMENTS
3,128,333 4/1964 Loughlin 358/76
4,097,892 6/1978 Balding 358/80
Primary Examiner—Robert L. Richardson
Attorney, Agent, or Firm—Spencer & Kaye
An apparatus for simulating a color printing process comprises a scanning unit including a table on which four color separation films formed from a color original are placed side by side, a pair of flying spot scanner tubes, four lens systems for projecting raster images of the scanner tubes onto the four color separation films and four photomultipliers for converting light rays passing through the respective films into subtractive primary color signals of cyan, magenta, yellow and black; a control unit for effecting various adjustments and correction upon the color signals and including a zero adjuster, an after image corrector, a continuous tone gamma corrector, a screen gamma corrector, a soft/hard corrector, a negative/positive corrector, a flat etching device, a contrast adjuster, a light adjuster, a shadow adjuster and a partial adjuster; a color reproduction process unit for converting the adjusted and corrected subtractive primary color signals into additive primary color image signals of red, green and blue; and a color monitor unit for receiving the additive primary color image signals and including a color cathode ray tube for displaying a color image. The color cathode ray tube has a chrominance characteristic which can completely display the actual printing colors and has about 700 to 800 scanning lines per frame.
17 Claims, 36 Drawing Figures
