Patent ID: 9117163
Filing Date: 2015-08-25
Classification: G06K,H04N

Abstract:
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.