Bidirectional printing that takes account of mechanical vibrations of print head

A printing system comprising a printer unit and a print control apparatus,

• said printer unit comprising a print head, which causes a specific partial area of main scan to have a lower positional accuracy of dot creation, and carrying out bi-directional printing, which causes said print head to create dots on a printing medium in both forward and backward passes of the main scan,
• said print control apparatus generating print data that is to be supplied to said printer unit, the print data comprising control data that controls actuation of said print head such that forward pass dots created in the forward pass of the main scan and backward pass dots created in the backward pass of the main scan are present at substantially equal rates in at least the specific partial area of the lower positional accuracy.

A recording medium in which a computer program is recorded in a computer readable manner, said computer program functioning to control a printer unit that comprises a print head, which causes a specific partial area of main scan to have a lower positional accuracy of dot creation, and carries out bi-directional printing, which causes said print head to create dots on a printing medium in both forward and backward passes of the main scan,

• said computer program causing a computer to attain the function of:
• generating control data that controls actuation of said print head such that forward pass dots created in the forward pass of the main scan and backward pass dots created in the backward pass of the main scan are present at substantially equal rates in at least the specific partial area of the lower positional accuracy.