PPI

PPI is the Acronym for Pixels Per Inch

A measure of pixel density, Pixels Per Inch (PPI) refers to the number of pixels packed into one inch of a display or image. The higher the PPI, the sharper and more detailed the image appears. PPI is commonly used to describe the resolution of digital displays such as computer monitors, smartphones, and tablets.

Pixel Density

PPI is a measurement of the pixel density of an electronic image device, such as a computer monitor or a television set's display, or image digitizing device such as a camera or image scanner. Horizontal and vertical density are usually the same, as most devices have square pixels, but differ on devices that have non-square pixels. Pixel density is not the same as resolution , where the former describes the amount of detail on a physical surface or device, the latter describes the amount of pixel information regardless of its scale.

PPI in Digital Displays

PPI is often used to describe the resolution of digital displays. The higher the PPI, the more pixels are packed into each inch, resulting in a sharper and more detailed image. Here are some examples of common PPIs for different devices:

Smartphones: Many modern smartphones have a PPI of around 300 or higher, which is considered Retina display quality. Some examples include the iPhone 11 with a PPI of 326, the Samsung Galaxy S21 with a PPI of 421, and the Google Pixel 5 with a PPI of 432.

Tablets: Like smartphones, many modern tablets have a PPI of around 300 or higher. Examples include the iPad Air with a PPI of 264, the Samsung Galaxy Tab S7+ with a PPI of 274, and the Microsoft Surface Pro 7 with a PPI of 267.

Laptops: The PPI of laptops varies depending on the size and resolution of the screen. For example, a 13-inch MacBook Pro has a PPI of 227, while a 15-inch MacBook Pro has a PPI of 220. Some high-end laptops may have PPIs of 300 or higher.

Monitors: Monitors also vary widely in terms of PPI. A 24-inch 1080p monitor has a PPI of around 92, while a 27-inch 1440p monitor has a PPI of around 109. High-end monitors with 4K resolution may have PPIs of 163 or higher.

PPI and Print Quality

While PPI and Dots Per Inch (DPI) refer to different things, they are related in that the resolution of an image or a display can affect the print quality. For example, an image with a low PPI may look blurry or pixelated when printed at a high DPI, as the printer is unable to reproduce the detail that was not present in the original image. Similarly, an image with a high PPI may look sharper when printed at a high DPI, as the printer is able to reproduce more detail from the original image.