Dpi is an abbreviation for dots per inch, and is translated into dots per inch, referring to the ability of an image capture tool or display tool to capture or display data per unit length (inch). Therefore, the more points, the more detailed the output pattern, in general, the screen mostly uses 72dpi resolution, and the print output must be 300dpi or higher. In addition ppi is the abbreviation of pixel per inch, mainly about optical resolution, because the photosensitive component has pixels (pixel).