Image processing apparatus, image processing method, and image processing program

An image processing method for performing one of color correction and density correction with respect to binary image data with using the binary image data and contone image data, which are based on an original image, to obtain output binary data, the image processing method comprising:

• performing the one of the color correction and the density correction with respect to the contone image data to generate correction data that is used to correct the binary image data;
• binarizing the correction data generated to generate corrected binary data;
• detecting presence of an edge from the binary image data;
• when the correction data generated increases a pixel value of the contone image data, setting a pixel located in one of regions sandwiching the edge therebetween as the edge pixel;
• when the correction data generated lessens the pixel value of the contone image data, setting a pixel located in the other of the regions sandwiching the edge therebetween as the edge pixel;
• selecting, for the pixel set as the edge pixel, the corrected binary data generated as the output binary data;
• and
• selecting, for a pixel not being set as the edge pixel, the binary image data as the output binary data.

A computer readable recording medium that stores an image processing program for causing a computer to execute an image processing for performing one of color correction and density correction with respect to binary image data with using the binary image data and contone image data, which are based on an original image, to obtain output binary data, the image processing comprising:

• performing the one of the color correction and the density correction with respect to the contone image data to generate correction data that is used to correct the binary image data;
• binarizing the correction data generated to generate corrected binary data;
• detecting presence of an edge from the binary image data;
• when the correction data generated increases a pixel value of the contone image data, setting a pixel located in one of regions sandwiching the edge therebetween as the edge pixel;
• when the correction data generated lessens the pixel value of the contone image data, setting a pixel located in the other of the regions sandwiching the edge therebetween as the edge pixel;
• selecting, for the pixel set as the edge pixel, the corrected binary data generated as the output binary data;
• and
• selecting, for a pixel not being set as the edge pixel, the binary image data as the output binary data.