Patent ID: 8441681

Claim:
A printing apparatus which prints a composite image formed of an enlargement portion and a non-enlargement portion of an original image on a printing medium, the printing apparatus comprising: an enlargement portion determining section which determines the enlargement portion, of the original image, which is to be enlarged in the composite image; an enlargement rate determining section which determines an enlargement rate of the enlargement portion with respect to the original image; a print data generating section which generates print data for printing the composite image based on image data of the original image, the enlargement portion determined by the enlargement portion determining section, and the enlargement rate determined by the enlargement rate determining section; and a printing mechanism which prints the composite image on the printing medium based on the print data generated by the print data generating section, wherein the print data generating section thins out the number of pixels of the non-enlargement portion based on a first thinning-out rate and thins out the number of pixels of the enlargement portion based on a second thinning-out rate which is smaller than the first thinning-out rate to generate the print data; wherein the print data generating section makes the second thinning-out rate smaller as the enlargement rate determining section determines the enlargement rate to be greater; wherein the print data generating section calculates the number of pixels of the enlargement portion by multiplying the number of pixels of the image data of the original image corresponding to the enlargement portion, which is obtained by thinning out the number of pixels of the enlargement portion based on the first thinning-out rate, by a value which is obtained by squaring the enlargement rate.