Image-forming apparatus, correction control method, and storage medium

A correction control method, comprising:

• forming a first detection pattern for density detection on an image carrier, wherein the first detection pattern includes a black first-sub-pattern and a non-black second-sub-pattern;
• controlling a first sensor to perform the density detection on the first-sub-pattern, and controlling a second sensor to perform the density detection on the second-sub-pattern;
• forming a second detection pattern for misregistration detection on the image carrier, wherein the second detection pattern includes a full-color third-sub-pattern and a full-color fourth-sub-pattern, the third-sub-pattern and the fourth-sub-pattern are disposed at two sides of the image carrier, and the third-sub-pattern is different from the fourth-sub-pattern;
• and
• controlling the first sensor to perform the misregistration detection on the third-sub-pattern and controlling the second sensor to perform the misregistration detection on the fourth-sub-pattern,
• wherein:
• the fourth-sub-pattern includes a non-black pattern including a cyan color line, a magenta color line and a yellow color line, and a pattern after superimposing of one type of non-black colors with black color.

A non-transitory computer-readable storage medium containing a computer program that, when being executed by a processor, causes the processor to implement a correction control method, wherein the correction control method comprises:

• forming a first detection pattern for density detection on an image carrier, wherein the first detection pattern includes a black first-sub-pattern and a non-black second-sub-pattern;
• controlling a first sensor to perform the density detection on the first-sub-pattern, and controlling a second sensor to perform the density detection on the second-sub-pattern;
• forming a second detection pattern for misregistration detection on the image carrier, wherein the second detection pattern includes a full-color third-sub-pattern and a full-color fourth-sub-pattern, the third-sub-pattern and the fourth-sub-pattern are disposed at two sides of the image carrier, and the third-sub-pattern is different from the fourth-sub-pattern;
• and
• controlling the first sensor to perform the misregistration detection on the third-sub-pattern and controlling the second sensor to perform the misregistration detection on the fourth-sub-pattern,
• wherein:
• the fourth-sub-pattern includes a non-black pattern including a cyan color line, a magenta color line and a yellow color line, and a pattern after superimposing of one type of non-black colors with black color.