Printer with correction data for number of tones which is fewer than number of tones that image data have

A printer apparatus comprising:

• a head having k (number) printing elements for printing image data;
• a printing element selecting section for selecting a printing element driven at the time of printing among the k printing elements of the head;
• and
• an image data correcting section for correcting the image data previous to the printing of the image data using the head;
• wherein the image data correcting section comprises:
• a correction data memorizing section for memorizing a correction data for a certain single tone among n (number) tones that the image data has for each of the printing elements;
• a tone detecting section for detecting the tone of the image data corresponding to each of the selected printing elements of the head;
• and
• a correction data generating section for generating a correction data for each of the selected printing elements, corresponding to the tone detected by the tone detecting section, by using the correction data memorized in the correction data memorizing section;
• and
• wherein the correction data generating section generates correction data for other tones than the single tone by multiplying the correction data memorized in the correction data memorizing section as a standard pattern by given correction coefficients.