Pixels per inch (PPI) or pixel density is used to describe the resolution of a digital image. A higher PPI results in a sharper and clearer image, while a lower PPI results in a blurry image. The number of pixels per inch affects the quality of images on TV screens, computer screens, and mobile devices. A good quality digital image should have 300 PPI or more. Images created for zooming purposes may have a higher resolution.
The term pixels per inch (PPI), also sometimes referred to as pixel density, is used to describe the resolution of a digital image. A pixel is the smallest unit used to create a digital image and usually exists as a single colored dot. For this reason, the resolution of an image is sometimes referred to as dots per inch (DPI) rather than pixels per inch, or PPI. The number of pixels that exist within a square inch of a digital image defines the PPI or DPI. If the image is expanded or reduced in size, the number of pixels per inch will change just as the resolution of the image will change.
When creating or choosing an image for publication online or in print, pixels per inch are important. An image with a low number of pixels per inch will appear blurry on a computer screen and when printed. This, of course, unless the image is significantly reduced in size. An image with a large number of pixels per inch, on the other hand, will appear quite sharp and clear both on a computer screen and in print.
In general, a good quality digital image will have 300 pixels per inch or more. There are cases where the number of pixels per inch is much higher. Images created for sites that allow users to zoom images up close are often created at a very high resolution. A website that sells jewelry, for example, might create images with a high enough resolution that users can zoom in on the details of the image up close.
The number of pixels per inch affects the quality of images displayed on television screens, as well as the quality of images displayed on computer screens. Televisions capable of displaying high-definition programs and events are capable of displaying more pixels per inch than televisions that do not have this type of capability. PPI also affects viewing on portable devices, such as cell phones and personal digital assistants. The same goes for mobile devices that are widely used for recreational purposes such as those that play music, games, television shows and movies.
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