1. A printing apparatus, comprising: a data acquisition section configured to acquire printing data; an image determination section configured to determine a character part or a picture part of an image indicated by the printing data; an image process section configured to erase the picture part or the part other than the character part from the image indicated by the printing data, and then determines a pixel of which a density value is lower than a pre-set density value in the image for which erasing has been executed, and then replaces a pixel value of the determined pixel with 0 or a value that indicates white; and a printing control section configured to execute a printing of an image processed by the image process section.