the printing data producing unit producing {HEAD ~ printing data} based on the image data and {TAIL ~ the correction information} so that the density of dots, printed by the printing elements, varies continuously across adjacent printing elements along the entire line of printing elements substantially according to at least one of a linear, quadratic, and elliptical function 
based on
the printing data producing unit producing { HEAD ~ printing data } based on the image data and { TAIL ~ the correction information } so that the density of dots , printed by the printing elements , varies continuously across adjacent printing elements along the entire line of printing elements substantially according to at least one of a linear , quadratic , and elliptical function
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH