Image forming apparatus, control method of image forming apparatus, and computer program

A control method of an image forming apparatus, comprising steps of:

• setting a reference area around a pixel of interest in an image to be processed;
• determining whether a pixel not to be referred exists in the reference area;
• if the pixel not to be referred exists, transforming the shape of the reference area based on the pixel;
• deciding a trapping color for the pixel of interest based on, a first peripheral pixel having a color component that is not included in the pixel of interest among peripheral pixels around the pixel of interest included in the reference area with the transformed shape;
• calculating a density of the trapping color based on the peripheral pixels;
• correcting a pixel value of the pixel of interest using the trapping color having the calculated density in the image to be processed;
• and
• forming an image having pixels corrected in said correcting step.

A control method of an image forming apparatus, comprising the steps of:

• setting a reference area around a pixel of interest in an image to be processed;
• determining whether a pixel not to be referred exists in the reference area;
• if the pixel not to be referred exists, transforming the shape of the reference area based on the pixel;
• deciding a trapping color for the pixel of interest based on, a first peripheral pixel having a color component that is not included in the pixel of interest among peripheral pixels around the pixel of interest included in the reference area with the transformed shape;
• correcting a pixel value of the pixel of interest using the trapping color in the image to be processed, and
• forming an image having pixels corrected by said correction unit.

A computer program stored in a computer-readable storage medium to cause a computer to execute a control method of an image forming apparatus, the control method comprising the steps of:

• setting a reference area around a pixel of interest in an image to be processed;
• determining whether a pixel not to be referred exists in the reference area;
• if the pixel not to be referred exists, transforming the shape of the reference area based on the pixel;
• deciding a trapping color for the pixel of interest based on, a first peripheral pixel having a color component that is not included in the pixel of interest among peripheral pixels around the pixel of interest included in the reference area with the transformed shape;
• calculating a density of the trapping color based on the peripheral pixels;
• correcting a pixel value of the pixel of interest using the trapping color having the calculated density in the image to be processed;
• and
• forming an image having pixels corrected by said correction unit.