What is dots per inch (DPI)?
Dots per inch, or DPI, is a term that refers to the printed resolution of graphics, images, or text.  Most commonly used in describing the sharpness and clarity of an image, DPI refers to the number of individual dots of ink that a toner or printer is able to produce within a one-inch space.

Higher dots per inch equals higher resolution
In general, printers with a higher amount of DPI create clearer, sharper images and graphics. But a printer’s DPI is dependent on more than one factor; there are a number of printers that offer varying methods of applying ink, and this can affect a specific printer’s DPI as well.

Factors that contribute to DPI measurement
One factor that contributes to DPI measurement is the method by which ink is applied by the printer. There are various methods and different printers for each way. For example, the dot-matrix printer uses tiny rods that strike an ink ribbon to apply the ink to paper. However, thought the method is easy, it offers a relatively low image resolution, from sixty to ninety dots per inch. On the other hand, an inkjet printer sprays the ink onto the paper via tiny nozzles, and generally produces image resolutions of 1200 DPI and up.

High resolution printers offer the sharpest images If you want a higher resolution image, it is generally better to go for an inkjet or laser printer. Both of these printers are excellent and produce high-resolution images, though the inkjet is one of the best printers for the highest quality; it has topped out at 9600 dots per inch! Thus, dots per inch just refers to your image quality, but it very important to understand if you’re preparing a proof for a printing company. Knowing how different resolutions are affected by DPI can make a huge difference in how your materials are ultimately produced.