Dropout color processing method and processing apparatus using same

A dropout color processing apparatus comprising:

• a means for inputting multicolor image data;
• a means for specifying a dropout color range in the image data;
• a means for converting the image data inside the dropout color range into a predetermined color;
• a means for specifying a dropout level for the specified dropout color range;
• a means for specifying a non-dropout color range;
• a means for specifying a non-dropout color range in the specified non-dropout color range;
• and
• a means for generating a dropout color boundary from the dropout color range and level and the non-dropout color range and level.

A dropout color processing apparatus comprising:

• a means for inputting a document as multicolor image data;
• a means for specifying a read condition of the image data;
• a means for dropping out and displaying the image data;
• a means for finding a read displacement of color information in accordance with the read condition of the image data;
• a means for correcting the read displacement;
• and
• a means for selecting a type of filter to be corrected from the read displacement.

A dropout color processing apparatus comprising:

• an input section that inputs a document as multicolor image data;
• a color space conversion section that converts the image data into a specified color space;
• a histogram creation section that creates a histogram of data in the color space;
• an outline creation section that creates an outline of data distribution based on the histogram;
• a threshold generation section that generates a threshold value based on the created outline and creates an extraction region in a color space;
• a specified color conversion section that converts a pixel of the image data into specified color depending on whether or not a result of converting a pixel of the image data into the color space belongs to an extraction region in the color space;
• and
• an output section that outputs a processed image,
• wherein the threshold generation section is provided with a plurality of threshold generation sections that use different techniques to generate an extraction region in a color space;
• and
• wherein, when the outline creation section creates an outline, the plurality of threshold generation sections are accordingly selected depending on whether or not a coordinate in a color space is located in a predetermined region.

A dropout color processing apparatus comprising:

• an input section that inputs a document as multicolor image data;
• a color space conversion section that converts the image data into a specified color space;
• a histogram creation section that creates a histogram of data in the color space;
• an outline creation section that creates an outline of data distribution based on the histogram;
• a threshold generation section that creates a threshold value based on the created outline and creates an extraction region in a color space;
• a specified color conversion section that converts a pixel of the image data into specified color depending on whether or not a result of converting a pixel of the image data into the color space belongs to an extraction region in the color space;
• an output section that outputs a processed image;
• a first range specification section that specifies an “extracted-color-inclusive” image area for the image data;
• a second range specification section that specifies an “extracted-color-exclusive” image area for the image data;
• a histogram creation section that extracts color space distribution in the “extracted-color-inclusive” image area and part or all of the “extracted-color-exclusive” image area;
• and
• a threshold generation section that generates a threshold value based on a result of the histogram extraction.

A dropout color processing method comprising the steps of:

• inputting a document as multicolor image data;
• converting the image data into a specified color space;
• creating a histogram of data in the color space;
• creating an outline of data distribution based on the histogram;
• generating a threshold value based on the created outline and creates an extraction region in a color space;
• converting a pixel of the image data into specified color depending on whether or not a result of converting a pixel of the image data into the color space belongs to an extraction region in the color space;
• and
• outputting a processed image,
• wherein the dropout color processing method includes a plurality of threshold generation methods that use different techniques to generate an extraction region in a color space;
• and
• wherein, when the outline is created, the plurality of threshold generation methods are accordingly selected depending on whether or not a coordinate in a color space is located in a predetermined region.

A dropout color processing method comprising the steps of:

• inputting a document as multicolor image data;
• converting the image data into a specified color space;
• creating a histogram of data in the color space;
• creating an outline of data distribution based on the histogram;
• creating a threshold value based on the created outline and creating an extraction region in a color space;
• converting a pixel of the image data into specified color depending on whether or not a result of converting a pixel of the image data into the color space belongs to an extraction region in the color space;
• outputting a processed image;
• specifying an “extracted-color-inclusive” image area and an “extracted-color-exclusive” image area for the image data;
• extracting color space distribution in the “extracted-color-inclusive” image area and part or all of the “extracted-color-exclusive” image area to create histograms;
• and
• generating a threshold value based on a result of the histogram extraction.