DPI (Dots per Inch)
What does DPI mean?
In printing technology, DPI (dots per inch) indicates how many dots are printed on a 1 inch (25.4 mm) long straight line. DPI is thus a measure of the print resolution and physical dot density of an image. This measurement is particularly important for the quality of image reproduction. In the reproduction of digital images and for the resolution of computer monitors, the term PPI – pixels per inch – is used synonymously with DPI.
The difference between PPI (pixels per inch) and dots per inch
In printing technology, DPI refers to the printing resolution of a printer. The higher this resolution, the sharper the printed results. An image printed at a resolution of 300 DPI (dots per inch) has a dot pitch of only about 0.085 millimeters. The unit of measurement PPI is used to indicate the so-called pixel density of a smartphone display or a computer screen. For example, an HD monitor can display 1920 pixels in width and 1080 pixels in height. However, this specification has nothing to do with the physical size of the monitor. At the same resolution, the monitor can be 50, 80 or 100 cm wide. The larger a monitor or display is with the same high resolution, the larger the pixels become and the image becomes coarser, i.e. the individual pixels can be clearly recognized.
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