Patent ID: 7839535

Claim:
A printing device comprising: a data acquiring unit configured to acquire image data; an image processing unit configured to generate display image data and printing image data based on the image data by with pixel value of a pixel at a first position in an image of the printing image data, performing an image process of modifying a pixel value of a first subject pixel of the printing image data at the first position or another position, the first position being determined according to a first parameter P 1 , with pixel value of a pixel at a second position in an image of the display image data, performing an image process of modifying a pixel value of a second subject pixel of the display image data at the second position or another position, the second position being determined according to a second parameter P 2 , and determining the second parameter P 2 such that a ratio (P 2 /P 1 ) of the second parameter P 2 and the first parameter P 1 is in a specified range that includes a ratio (Px 2 /Px 1 ) of a display pixel count Px 2 representing a size of the image of the display image data and a printing pixel count Px 1 representing a size of the image of the printing image data; a display unit configured to display an image based on the display image data; and a printing unit configured to perform printing based on the printing image data, wherein the first position is a first relative position relative to the first subject pixel, the second position is a second relative position relative to the second subject pixel, the image processing unit: modifies the pixel value of the first subject pixel using pixel values of one or more pixels in the first relative position relative to the first subject pixel, and modifies the pixel value of the second subject pixel using pixel values of one or more pixels in the second relative position relative to the second subject pixel, and the image processing unit: determines a type of an image of the image data from among a plurality of types of images including a first type of image and a second type of image which includes clear contours more than the first type of image, and determines the second parameter P 2 such that when the image of the image data is the second type of image, (P 2 /P 1 ) is smaller than when the image of the image data is the first type of image.