Image forming apparatus, color-misregistration correcting method, and computer program product

A color-misregistration correcting method of correcting color misregistration occurred in an image forming apparatus that includes recording heads that eject recording liquids of a plurality of colors onto a recording medium, the color-misregistration correcting method comprising:

• forming a reference patch on the recording medium by overlaying dot array patterns recorded with the recording liquids of different colors, the dot array patterns having no correlation therebetween;
• forming a detection patch group including detection patches on the recording medium, each of the detection patches being formed by overlaying dot array patterns recorded with the recording liquids of the different colors, the dot array patterns having a same cycle of regular dot array, the detection patches being allocated with different misregistration amounts of the dot array patterns;
• and
• correcting color misregistration based on results of comparison between color tone of the reference patch and color tone of each of the detection patches of the detection patch group.

A computer program product comprising a non-transitory computer-readable medium including computer-readable program codes embodied in the medium for correcting a color misregistration occurred in an image forming apparatus that includes recording heads that eject recording liquids of a plurality of colors onto a recording medium, the program codes when executed causing a computer to perform:

• causing the image forming apparatus to form a reference patch on the recording medium by overlaying dot array patterns recorded with the recording liquids of different colors, the dot array patterns having no correlation therebetween;
• causing the image forming apparatus to form a detection patch group including detection patches on the recording medium, each of the detection patches being formed by overlaying dot array patterns recorded with the recording liquids of the different colors, the dot array patterns having a same cycle of regular dot array, the detection patches being allocated with different misregistration amounts of the dot array patterns;
• and
• causing the image forming apparatus to correct color misregistration based on results of comparison between color tone of the reference patch and color tone of each of the detection patches of the detection patch group.