Printer which compensates for paper unevenness

An ink-jet printing apparatus, comprising:

• a print head that scans across a recording medium and ejects ink onto the recording medium;
• a mechanism for inducing a predetermined unevenness pattern into the recording medium at least in an area in which the print head scans across the recording medium, wherein the predetermined unevenness pattern to be compensated for by adjusting an ejection frequency of the print head;
• a trigger mechanism for effecting ejection of the ink;
• a device for determining an adjusted ink ejection frequency based on the induced predetermined unevenness pattern;
• and
• a controller for controlling the trigger mechanism to effect ink ejection at the adjusted ink ejection frequency.

Computer executable process steps for controlling a printing operation of a printing device in which a print head scans across a recording medium and ejects ink from a print head onto the recording medium, comprising the steps of:

• inducing a predetermined unevenness pattern into the recording medium, which is to compensated for by adjusting an ejection frequency of the print head;
• adjusting an ink ejection frequency of the print head based on the induced unevenness pattern;
• and
• controlling ink ejection by the print head based on the adjusted frequency.

A computer readable medium which stores executable process steps for controlling a printing operation of a printing device in which a print head scans across a recording medium and ejects ink from a print head onto the recording medium, the executable process steps comprising:

• inducing a predetermined unevenness pattern into the recording medium, which is to compensated for by adjusting an ejection frequency of the print head;
• adjusting an ink ejection frequency of the print head based on the induced unevenness pattern;
• and
• controlling ink ejection by the print head based on the adjusted frequency.