Image processor
First Claim
1. An image processor, wherein each image data is processed to obtain image data for printing for each pixel, comprising:
- a read means for reading a document image to send an image data of three primary colors of an additive color system;
an edge decision means for deciding an edge image portion according to the image data received from said read means;
an achromatic color decision means for deciding an achromatic color according to the image data received from said read means;
a generation means for generating image data of three primary colors in a subtractive color system and of a black color from the image data received from said read means;
a correction means for conducting edge emphasis processing not on the image data of the three primary colors in the subtractive color system, but on the image data of the black color, in an edge image portion of achromatic color decided by said edge decision means and said achromatic color decision means.
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Accused Products
Abstract
In an image possessor, two kinds of color differences in the orthogonal coordinate axes in the hue plane in the color space are separated from the digital data of three primary colors, and the separate color signals are synthesized to generate the chroma signal. When the digital data of the three primary colors are converted to the data of the reproduction colors with use of the under color remove amount and the black paint amount, an under color remove amount is subtracted from the digital data of the three primary colors, while a black paint amount which is the black data obtained from the digital data is generated to print with black toners. The under color remove amount and the black paint amount are increased with increase in the chroma signal according to the color data of the three primary colors and the chroma signal at the same pixel position. The edge emphasis is performed not on the image data of the three primary colors in the subtractive color system, but on the image data of the black color, in an edge image portion of achromatic color. Further, in the edge emphasis, a first change in the value signal and a second change in the image data for image reproduction are detected, and the two changes are synthesized. Then, the edge emphasis is conducted on the image data for printing or on the image data for color reproduction according to the synthesized change.
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Citations
12 Claims
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1. An image processor, wherein each image data is processed to obtain image data for printing for each pixel, comprising:
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a read means for reading a document image to send an image data of three primary colors of an additive color system; an edge decision means for deciding an edge image portion according to the image data received from said read means; an achromatic color decision means for deciding an achromatic color according to the image data received from said read means; a generation means for generating image data of three primary colors in a subtractive color system and of a black color from the image data received from said read means; a correction means for conducting edge emphasis processing not on the image data of the three primary colors in the subtractive color system, but on the image data of the black color, in an edge image portion of achromatic color decided by said edge decision means and said achromatic color decision means. - View Dependent Claims (2, 3)
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4. An image processor, wherein each image data is processed to obtain image data for printing for each pixel, comprising:
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a read means for reading a document image to send an image data of three primary colors of an additive color system; a calculation means for calculating the chroma from the image data received from said read means; a generation means for generating image data of three primary colors in a subtractive color system and of a black color from the image data received from said read means; a first determination means for determining an under color remove amount which is subtracted from the image data of the three primary color generated by said generation means according to the chroma calculated by said calculation means; and a second determination means for determining a black paint image data to be used as one of image data for printing according to the chroma calculated by said calculation means. - View Dependent Claims (5, 6)
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7. An image processor, wherein each image data is processed to obtain image data for printing for each pixel, comprising:
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a read means for reading a document image to send an image data; a first generation means for generating a value signal from the image data obtained by said read means; a first edge detection means for detecting a change in the value signal generated by said first generation means;
deciding an edge image portion according to the image data received from said read means;a second generation means for generating image data for printing from the image data obtained by said read means; a second edge detection means for detecting a change in the image data for printing generated by said second generation means; a synthesis means for synthesizing the change of the value signal detected by said first edge detection means and the change of the image data detected by said second edge detection means as to the same pixel in the document image; and a correction means for conducting edge emphasis processing on the image data for printing according to the change synthesized by said synthesis means. - View Dependent Claims (8)
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9. An image processor, wherein each image data is processed to obtain image data for color reproduction for each pixel, comprising:
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a read means for reading a document image to send an image data of three primary colors of an additive color system; a first generation means for generating a value signal from the image data obtained by said read means; a first edge detection means for detecting a change in the value signal generated by said first generation means;
deciding an edge image portion according to the image data received from said read means;a second generation means for generating image data for color reproduction from the image data obtained by said read means; a second edge detection means for detecting a change in the image data for color reproduction generated by said second generation means; a synthesis means for synthesizing the change of the value signal detected by said first edge detection means and the change of the image data detected by said second edge detection means as to the same pixel in the document image; and a correction means for conducting edge emphasis processing on the image data for color reproduction according to the change synthesized by said synthesis means. - View Dependent Claims (10, 11, 12)
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Specification