Adjustment method of recording head and recording apparatus

In a recording apparatus that includes a recording head in which a plurality of nozzles are arranged and that performs recording by ejecting liquid droplets while relatively moving in a relative movement direction with respect to a recording medium, a method for adjusting a landing position of a liquid droplet in the recording apparatus, the method comprising:

• reading a pattern image by dots formed by the ejected liquid droplets;
• calculating a tendency of a spatial positional relationship between each of the nozzles and a dot corresponding to each of the nozzles based on the read pattern image by:
• generating an approximate straight line from the pattern image;
• and
• determining the tendency based on an inclination of the approximate straight line determined from the pattern image,
• wherein the landing position of the liquid droplet ejected from each of the nozzles is adjusted based on the tendency calculated in the calculating the tendency of the spatial positional relationship.