Printing apparatus and method configured for re-halftone image data
First Claim
1. An image data processing apparatus for processing previously halftoned data that has been halftoned so that a proportion of dot formation corresponding to gradation values of an image reaches a first dot generation rate, as image data representative of the image, the image data processing apparatus comprising:
- a re-halftone processing unit configured to carry out a re-halftone process by using an error diffusion technique based on first gradation values corresponding to ON-dots in the previously halftoned data; and
an ON-dot gradation value setting unit configured to set second gradation values corresponding to the ON-dots in the re-halftone process using the error diffusion technique, such that the dot generation rate in the re-halftone process reaches a second dot generation rate different from the first dot generation rate,the first gradation values being determined from a relationship between an original print apparatus for which original dot data is generated and a target print apparatus where printing is to be carried out.
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Accused Products
Abstract
An image data processing apparatus processes previously halftoned data that has been halftoned so that a proportion of dot formation corresponding to gradation values of an image reaches a first dot generation rate, as image data representative of the image. The image data processing apparatus includes a re-halftone processing unit configured to carry out a re-halftone process by using an error diffusion technique based on first gradation values corresponding to ON-dots in the previously halftoned data, and an ON-dot gradation value setting unit configured to set second gradation values corresponding to the ON-dots in the re-halftone process using the error diffusion technique, such that the dot generation rate in the re-halftone process reaches a second dot generation rate different from the first dot generation rate.
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Citations
8 Claims
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1. An image data processing apparatus for processing previously halftoned data that has been halftoned so that a proportion of dot formation corresponding to gradation values of an image reaches a first dot generation rate, as image data representative of the image, the image data processing apparatus comprising:
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a re-halftone processing unit configured to carry out a re-halftone process by using an error diffusion technique based on first gradation values corresponding to ON-dots in the previously halftoned data; and an ON-dot gradation value setting unit configured to set second gradation values corresponding to the ON-dots in the re-halftone process using the error diffusion technique, such that the dot generation rate in the re-halftone process reaches a second dot generation rate different from the first dot generation rate, the first gradation values being determined from a relationship between an original print apparatus for which original dot data is generated and a target print apparatus where printing is to be carried out. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A print system for printing onto a predetermined print medium, the print system comprising:
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a data storage apparatus configured to store a plurality of sets of previously halftoned data that has been halftoned so that a proportion of dot formation corresponding to gradation values of an image reaches a first dot generation rate; a re-halftone processing apparatus for which input data is data selected from the stored plurality of sets of previously halftoned data and which is configured to re-halftone the input data using an error diffusion technique so as to reach a second dot generation rate different from the first dot generation rate; and a target print apparatus configured and arranged to accept the previously re-halftoned data and printing by forming predetermined dots on a print medium, the re-halftone processing apparatus being configured to set to different values the first gradation values corresponding to ON-dots in the previously halftoned data and second gradation values corresponding to the ON-dots in the re-halftone process using the error diffusion technique which are to be formed on the print medium, the first gradation values being determined from a relationship between an original print apparatus for which original dot data is generated and the target print apparatus where printing is to be carried out.
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8. A method for converting image data representative of an image, using as input data previously halftoned data that has been halftoned so that a proportion of dot formation corresponding to gradation values of the image reaches a first dot generation rate, the method comprising:
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using an error diffusion technique to re-halftone the input data so as to reach a second dot generation rate different from the first dot generation rate; and setting to different values the first gradation values corresponding to ON-dots in the previously halftoned data and second gradation values corresponding to the ON-dots in the re-halftone process using the error diffusion technique, the first gradation values being determined from a relationship between an original print apparatus for which original dot data is generated and a target print apparatus where printing is to be carried out.
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Specification