Image forming apparatus adjusting image forming position on sheet

An image forming apparatus, comprising:

• a plurality of decks in which a plurality of sheets is contained;
• a conveyer configured to convey a sheet from the plurality of decks;
• an image former configured to form an image on the sheet conveyed by the conveyer;
• and
• a controller configured to:
• control to the image former to form a test image on the sheet;
• generate an adjustment condition based on read data related to the test image formed on the sheet;
• store the adjustment condition, wherein the adjustment condition is associated with a size of the sheet, and a direction of the sheet conveyed by conveyer, and a grain of the sheet;
• select the adjustment condition based on the size of the sheet, the direction of the sheet, and the grain of the sheet;
• and
• adjust, based on the selected adjustment condition, a position of the image to be formed on the sheet by the image former,
• wherein the controller controls the image former to form a first test image on a first sheet, and generates a first adjustment condition based on a first read data related to the first test image formed on the first sheet,
• wherein a grain of the first sheet is parallel to a long side of the first sheet;
• wherein the controller controls the image former to form a second test image on a second sheet, and generates a second adjustment condition based on a second read data related to the second test image formed on the second sheet,
• wherein a grain of the second sheet is parallel to a short side of the second sheet.