1. An image processing method for recording an image on a recording medium by performing relative scanning between the recording medium and a recording head including a nozzle configured to discharge ink, comprising: determining multilevel recording data such that when a multilevel data value corresponding to a first pixel on the recording medium is equal to or larger than a predetermined threshold value, the multilevel data value is employed as a value of the multilevel recording data, while when the multilevel data value is smaller than the predetermined threshold value, the multilevel data value is corrected based on a first parameter representing a degree of condensation of ink when the first pixel is recorded by a nozzle assigned to record the first pixel, and the corrected multilevel data value is employed as the value of the multilevel recording data; and generating a second parameter based on the determined value of the multilevel recording data and the first parameter, the second parameter representing a degree of condensation of ink in the nozzle used in recording the first pixel when a second pixel is recorded by the nozzle next after the first pixel.