Image processing method, image processing apparatus and recording medium
First Claim
1. An image processing method for obtaining an image by performing a gradation process for a plurality of kinds of image data, comprising the steps of:
- performing a gradation process on each image data of the plurality of kinds of image data by selectively applying a first gradation processing method and a second gradation processing method wherein the second gradation processing method has a gradation processing speed higher than the first gradation processing method does; and
rearranging a pixel gradation-processed with the second gradation processing method with reference to a pixel gradation-processed with the first gradation processing method.
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Abstract
The present invention relates to an image processing method, an image processing apparatus and a recording medium that convert a grey scale image into an area gradation image. The present invention intends to provide an image processing method, an image processing apparatus and a recording medium capable of increasing processing speed in a state where high image quality is maintained. In the image processing method and the image processing apparatus according to the present invention, image data of a C component and image data of an M component in grey scale image data are converted into halftone image data in accordance with an error diffusion method, and image data of a Y component are converted into halftone image data in accordance with a blue noise mask method.
8 Citations
11 Claims
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1. An image processing method for obtaining an image by performing a gradation process for a plurality of kinds of image data, comprising the steps of:
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performing a gradation process on each image data of the plurality of kinds of image data by selectively applying a first gradation processing method and a second gradation processing method wherein the second gradation processing method has a gradation processing speed higher than the first gradation processing method does; and rearranging a pixel gradation-processed with the second gradation processing method with reference to a pixel gradation-processed with the first gradation processing method. - View Dependent Claims (2, 3, 4, 5)
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6. An image processing apparatus for obtaining an image by performing a gradation process for a plurality of kinds of image data, comprising:
an image processing part performing a gradation process on each image data of the plurality of kinds of image data by selectively applying a first gradation processing method and a second gradation processing method wherein the second gradation processing method has a gradation processing speed higher than the first gradation processing method does, and rearranging a pixel gradation-processed with the second gradation processing method with reference to a pixel gradation-processed with the first gradation processing method. - View Dependent Claims (7, 8, 9, 10)
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11. A computer readable recording medium for storing a program, the program causing a computer to execute the steps of:
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performing a gradation process on each image data of the plurality of kinds of image data by selectively applying a first gradation processing method and a second gradation processing method wherein the second gradation processing method has a gradation processing speed higher than the first gradation processing method does; and rearranging a pixel gradation-processed with the second gradation processing method with reference to a pixel gradation-processed with the first gradation processing method, wherein the first gradation processing method is an error diffusion method and the second gradation processing method is a blue noise mask method.
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Specification