Time modulated stochastic screening
AssigneeAgfa-Gevaert
InventorsJacobus Bosschaerts, Rene Govaert, Paul Delabastita
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Abstract
A method for generating a screened reproduction of a multiple tone image comprising the steps of frequency modulation screening the multiple tone image to obtain screened data representing tones of the multiple tone image in terms of halftone dots, reproducing the halftone dots on an imaging element by means of a scanwise exposure, characterized in that the scanwise exposure for rendering a halftone dot is time modulated.
Claims8
A method for generating a screened reproduction of a multiple tone image comprising the steps of:
- frequency modulation screening said multiple tone image to obtain screened data representing tones of said multiple tone image in terms of halftones dots;
- reproducing said halftone dots on an imaging element by means of a scanwise exposure;
- wherein said scanwise exposure for rendering a halftone is time modulated by altering an exposure time for rendering halftone dots of low tones in one sense relative to halftone dots of mid tones, and altering an exposure time for rendering halftone dots of high tones in an opposite sense.
A method for generating a screened reproduction of a multiple tone image comprising the steps of:
- frequency modulation screening said multiple tone image to obtain screened data representing tones of said multiple tone image in terms of halftones dots;
- reproducing said halftone dots on an imaging element by means of a scanwise exposure;
- wherein said scanwise exposure for rendering a halftone is time modulated by varying an exposure time for rendering halftone dots in accordance with the number of neighbouring halftone dots.
Dependencies are inferred from the claim text.