Autotypical screening with optimised dotshape
First Claim
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1. A method for generating a screened reproduction of a multiple tone image comprising the steps of:
- autotypical screening said multiple tone image to obtain screened data representing tones of said multiple tone image in terms of halftone dots;
reproducing said halftone dots on an imaging element by means of a scan-wise exposure having a fast scan direction; and
shaping said halftone dots such that they have a longer and a shorter dimension and a shape which is compact, in said fast scan direction, by having said shorter dimension aligned along said fast scan direction and such that they have a ratio of peripheral length to surface area which is minimal, at least in extreme regions of a tone scale.
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Abstract
A method for generating a screened reproduction of a multiple tone image comprises the steps of autotypical or amplitude 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 scan-wise exposure by means of a laser or a LED, wherein in extreme regions of the tone scale the shape of the halftone dots is compact, characterized in that the halftone dots have a ratio of peripheral length to surface area which is minimal.
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Citations
16 Claims
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1. A method for generating a screened reproduction of a multiple tone image comprising the steps of:
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autotypical screening said multiple tone image to obtain screened data representing tones of said multiple tone image in terms of halftone dots; reproducing said halftone dots on an imaging element by means of a scan-wise exposure having a fast scan direction; and shaping said halftone dots such that they have a longer and a shorter dimension and a shape which is compact, in said fast scan direction, by having said shorter dimension aligned along said fast scan direction and such that they have a ratio of peripheral length to surface area which is minimal, at least in extreme regions of a tone scale. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for generating a screened reproduction of a multiple tone image comprising the steps of:
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autotypical screening said multiple tone image to obtain screened data representing tones of said multiple tone image in terms of halftone dots; reproducing said halftone dots on an imaging element by means of a scan-wise exposure; shaping said halftone dots such that they have a shape which is compact by having a ratio of peripheral length to surface area which is minimal, at least in extreme regions of a tone scale; and performing a dedicated mixing of different compact halftone dot shapes to represent a specific tone level requiring a theoretical number of microdots which cannot be used to produce a single type of halftone dot having a desired shape.
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Specification