Image process apparatus and image process method
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United States of America Patent
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May 28, 2002
Grant Date -
N/A
app pub date -
Nov 10, 1998
filing date -
Nov 14, 1997
priority date (Note) -
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Abstract
The invention is to provide image process apparatus and method which can represent, in case of performing quantization by using a blue noise mask, a blue noise characteristic for not only a halftone image based on a quantization result of one color but also a halftone image of mixed color formed based on quantization data of plural colors. That is, each of the input color image data of the plural colors is quantized into the quantization data of which bit number is smaller than that of the corresponding input data, by using any one of different blue noise masks, and a color image is formed based on the quantization data. The masks are respectively formed from one blue noise mask by a converter, and the mixed color produced based on the quantization results from these two masks represents the blue noise characteristic.
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