Calibration ensures that the printer outputs the correct colors and aligns the print head properly. This process adjusts the printer to compensate for any variances in print quality. Incorrect options like 'Cleaning the print head' or 'Increasing the printing speed' are not the primary purpose of calibration, though they may be results of general maintenance. 'Reducing power consumption' may be a beneficial side effect if a non-calibrated printer was previously overworking due to misalignment, but it is not the reason for calibration.